A voltmeter should have: To verify Ohm’s Law by calculating voltage, current and resistance based on different views of Ohm’s law, as well as measuring those values to compare the theoretical results with the actual results. Least count of ammeter = = …………….. ampere. The refractive index of a particular material is 1.67 for blue light, 1.65 for yellow light and 1.63 for red light. (b) 0.025 V (a) battery and ammeter Аnswer: B. (a) Potential difference is measured by voltmeter. (a) 25 (b) 20 (c) 15 (d) 10. - [Presenter] Let's explore how we can practically verify whether any material obeys Ohm's law. Keep the devices as shown in the circuit diagram. Question 3: (b) power This shows that V∝I. The process is: A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. Calculate Power, Current, Voltage or Resistance. Theory. For the two students, the value of the emf used by student (A) and the resistance due to the rheostat (b) ampere A $60\, W$ bulb is already switched on. Ohm’s Law and Kirchhoff’s Laws place constraints on voltages and current within a circuit, thus providing important information about these variables. Semiconductor Electronics: Materials Devices and Simple Circuits, The shown p- V diagram represents the thermodynamic cycle of an engine, operating with an ideal monoatomic gas. A student wanted to make a battery of 6 V of cells with e.m.f 1.5 V each. (a) (d) in both the set-ups. Define electric current. It means there is: How many electrons are present in 1 coulomb? CBSE Maths notes, CBSE physics notes, CBSE chemistry notes, Experiment To Verify Ohm’s Law Class 10 CBSE, Ohm’s Law Experiment Class 10 Pdf Introduction. (a) volt (b) ammeter and voltmeter To verify Ohm’s law for a given resistive network. (c) joule Question 27: 5. (c) moderate resistance Experimental Verification of Ohm’s Law. The resistance of an alloy (b) becomes double volt. The connecting wires should be thick copper wires and the insulation of their ends should be removed using the sand paper. Do not proceed with your experiments until your TA has checked the circuit. The instrument used to measure electric current is If the known resistor is replaced by the nichrome wire than the current will decrease and the potential difference will decrease. (a) increases with temperature 2. (d) As per Ohm’s law of formula calculation. The ammeter connected in a circuit reads 0.01 A when battery is switched off. The piston is slightly displaced from the equilibrium position and released. The voltmeter is always connected in parallel in a circuit. (c) 0.050 V 249 kPa and temperature $27^\circ\,C$. Question 38: The current flowing through a resistor connected in an electrical circuit and the potential difference developed across its ends are shown in the given diagram. What are the factors that affect resistance? Аnswer: The cell is connected to the charger and the electrons are stored in it which can be used later. Its unit is volt and is measured by a device called voltmeter. Question 2: (d) Resistance depends on all the given factors. Set up your circuit with the power supply OFF and the output voltage turned DOWN TO ZERO. To calculate the least count of voltmeter. To study the dependence of potential difference (V) across a resistor on the current (I) passing through it and determine its resistance. Question 11: A contains an ideal gas at standard temperature and pressure. (b) (a) in both the set-ups. Question 33: (b) Circuit B can help in verification of ohm’s law. (d) a finite reading in both the ammeter and the voltmeter. Аnswer: 5. Volt meter is connected at the ends of the iron nail in parallel combination. Connect them with the connecting wires and keep the key open. In the circuit given below the voltmeter and ammeter readings are respectively (d) none of these, Question 2: The potential difference V across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains same. (a) Voltmeter (a) damage of instrument The resistance of the conductor would be: Question 23: (d) 75 V. Question 30: Аnswer: (c) 1 A in both the cases To verify Ohm's law, a student connects the voltmeter across the battery as, shown in the figure. (d) D and A. (c) 0.2 A In (B) as, the initial point at rheostat is in circuit therefore, minimum resistance is in circuit. In circuit II, the current flows and hence 2V. While 4 band resistors are most commonly available we’ll use them in next problems. $ What is the fundamental frequency of steel if density and elasticity of steel are $7.7 \times 10^3 \, kg/m^3 \, and \, 2.2 \times 10^{11} N/m^2 $ respectively? Ohm performed repeated experiments on a resistor, applied different voltages, measured current and found relationship between these quantities. Question 40: (a) Voltmeter is connected in parallel while ammeter is connected in series. Аnswer: (c) 2 V in circuit I and 0 V in circuit II (d) 0.01. (d) some reading in the voltmeter but no reading in ammeter. (d) 2 Ω. Once the circuit is connected, insert the key and check the rheostat, adjust its slider and see whether the ammeter and voltmeter readings are shown. To verify ohm's law, one galvanometer is used as ammeter and other galvanometer as voltmeter. Аnswer: Question 9: Questions based on Reporting and Interpretation Skills What precautions should be taken to do Ohm’s law experiment ? Question 6: A voltmeter has a least count of 0.05 volt. Аnswer: The ammeter should be connected in series with the resister such that the current enters at the positive terminal and leaves at the negative terminal of the ammeter. Question 7: What will you infer from such an observation? In National 5 Physics calculate the resistance for combinations of resistors in series and parallel. If the resistor of a known resistance value is replaced with a nichrome wire of 10 cm length (say). (c) Current (I) =V/R= 1 A and potential difference (V) = RI = 2V. Question 9: Why is it advised to clean the ends of connecting wires before connecting them? single resistor to verify Ohm's Law using resistors in dc circuits 2. What is the gravitational force on it, at a height equal to half the radius of the earth? If the potential difference across the ends of a conductor is 1 volt and the current flowing through it is 1 ampere, then resistance of the conductor is 1 ohm. If charge $q_0$ is given a small displacement $y ( y << a)$ along the y-axis, the net force acting on the particle is proportional to, Diameter of a plano-convex lens is 6 cm and thickness at the, A charge Q is uniformly distributed over a long rod AB of length L as shown in the figure. What does X, Y and Z in the circuit stand for respectively? Question 22: Question 36: The plot correctly showing the dependence of the current 1 on the potential difference V across a resistor R is. • Construct series and parallel circuits. Its SI units is ohm(Ω). The unit of charge is In an experiment to study dependence of current on the potential difference across a given resistor, four students P, Q, R and S kept the plug key in the circuit closed for time t{ and then open for time t2 as given in the table below: The best choice of open and closed time is that of student Аnswer: (a) The voltmeter has been correctly connected in the circuit. (b) 1.5 Ω Question 4: (b) 2 V in both the circuits 4 Resistors 50Ω, 100Ω, 0.5Watt … According to ohm’s law, the resistance R is the ratio of the voltage U across a conductor and the current I flowing through it: Аnswer: Question 9: (a) 0.020 V A sonometer wire of length 1.5 m is made of steel. According to Ohm’s law, the relationship between V, I and R is, Question 8: Question 35: The least count of the ammeter is Question 20: The straight line of the graph indicates that current I is directly proportional to voltage V. Question 8: (a) volt (a) material of the wire (c) positive error Question 43: The resistance of nichrome is more as compared to manganin. Question 6: A. An ammeter has a range of (0-3) ampere and there are 30 divisions on its scale. (b) zero error The graph of V-I is a straight line. 4. Аnswer: Thus, ohm’s law is verified by this experiment. (b) decreases with temperature For the experiment “to find the equivalent resistance of the two given resistors connected in parallel” the following circuit was drawn by a student. The diagram besideshows the single circuit that we will use for thisexperiment:We could choose a Voltage … (c) is constant with rise in temperature How do the values of current through the nichrome wire and potential difference across the two ends of it may change? (b) ammeter (b) Ammeter is in series and voltmeter is in parallel. Types of cells: Identify the circuit in which the electrical components have been properly connected. (d) negative error. For the circuits shown in figures I and II, the ammeter readings would be: 3) The electrical current should not flow the circuit for long time, Otherwise its temperature will increase and the result will be affected. They kept the contact J in four different positions, marked (a), (b), (c) and (d) in the two figures. While you don’t have to COMPLETELY know and understand ohms law ,because there are formulas on our web site that will help you with the math, you do have to understand that ohms law will guide you to select the correct value components needed to safely operate your lads; specifically the current limiting resistors needed. What will you infer if the deflection takes place in opposite direction? (d) Voltmeter, Ammeter and Rheostat. (d) none of these. He would observe Experiment to verify ohm's law . Question 1: is of 1 volt. (c) Ammeter, Voltmeter and Rheostat (a) 2 V and 2 A Аnswer: The resistance of a wire depends on: Why? The rate of flow of charge in a conductor is called electric current. KCL AND KVL DEEE-EMS LAB SAI SPURTHI INSTITUE TECHNOLOGY- B.GANGARAM VERIFICATION OF KIRCHOFF CURRENT AND VOLTAGE LAWS AIM: To verify Kirchhoff’s current law and voltage law. In a voltmeter there are 20 divisions between the 0 mark and 0.5 V mark. The SI unit of resistance of a wire is Question 4: Question 3: (a) We must keep the circuit closed for a relatively shorter time and open for a relatively longer time. (c) rheostat and ammeter Least count of ammeter and voltmeter. The measured voltage is plotted as a function of the current, and the following graph is obtained; If V 0 is almost zero, identify the correct statement : (1) The value of the resistance R is 1.5 Ω (b) In (A) as only cell is in circuit, therefore, voltmeter reads minimum emf. The nature of resistor, i.e., material of a conductor. The value of R is found to be same and constant in all three readings. Ohm's Law 1. (d) ammeter and voltmeter. (b) Voltmeter, Ammeter and Resistance 4, 5 or 6 bands are designed over the bodies of resistors. (d) Least count is range divided by number of divisions. Аnswer: IMPORTANT: Special concerns for Ohm’s law experiment 1. Name of the apparatus Range Type Quantity 1 Ammeter 0-100mA 1 No. (d) is zero. Find the value of the resistance of the resistor is. NAME OF THE APPARATUS; S.No. (c) some reading in the ammeter but no reading in the voltmeter. (c) C and D In the above circuit diagram, the components connected in parallel are: (c) becomes halved Question 42: Аnswer: Question 7: The two faults pointed out correctly by the teacher, are Check the +ve and -ve terminals of voltmeter before connecting it in the circuit. (a) 0.75 V Question 4: (c) Least count is range divided by number of divisions. What will happen to current passing through a conductor if potential difference across it is doubled and the resistance is halved? Jyothi Lakshmi wants to verify Ohm’s law experimentally. On increasing the length of the resistor its resistance increases. Аnswer: (b) Ammeter (d) (a) in set-up (A) and (d) in set-up (B). B is completely evacuated. (d) variable resistance. This law states that voltage is equal to the product of the total current and the total resistance. Which of the following set-up is correct for the verification of Ohm’s law. The least value that an instrument can measure is called its least count. (d) Through series, the current flows the same. Connections should be made as per the circuit. (1) Here, Here R is a constant for the given element and is called its resistance. The current flowing through a resistor connected in a circuit and the potential difference developed across its ends are as shown in the diagram. It is measured by the device called ammeter. 1 No. Procedure, Observation Table Color coding technique is used to represent the values of resistors in the form of colored bands. (c) Battery The unnecessary current flows through the circuit causes the heating effect and changes the resistance. (a) 0 A in circuit I and 1 A in circuit II (a) 0.02 A PRECAUTIONS: - 1) All the connection should be tight. (c) rheostat Question 15: (a) 0 V in both the circuits (a) volt Assuming that the system is completely isolated from its surrounding, the piston executes a simple harmonic motion with frequency, The graph between angle of deviation $(\delta)$ and angle of incidence (i) for a triangular prism is represented by, Two charges, each equal to $q$, are kept at $x = - a$ and $x = a$ on the $x-axis$. What is the unit of potential difference and how do we measure potential difference? (b) Least count is range divided by number of divisions. (d) all of the above. (d) coulomb, Question 6: (b) The -ve of voltmeter should be connected to +ve of ammeter and R( and R, should be connected in parallel. • Test the validity of Ohm’s law. Range of voltmeter = VR…………………… Aim of experiment The main purpose of this laboratory experiment is: to learn the proper use of electrical meters to measure the resistance of resistor by different methods to examine the current-voltage relation for the simplest circuit element i.e. Аnswer: (b) damage of resistor The supply voltage in a room is $120\, V$. This helps in taking accurate readings. Such cells are also called accumulators or storage cells. (a) battery and ammeter Define 1 volt. Question 37: The plot correctly showing the dependence of the current 1 on the potential difference V across a resistor R is. (d) 0 V in circuit I and 2 V in circuit II. S.I. (a) potential difference To calculate the least count of ammeter. Use Ohms law to relate resistance, current and voltage. On replacing nichrome wire with manganin the current will increase and the potential difference will increase. Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. (b) Resistor and voltmeter are the two components connected in parallel. The correct arrangement is: Question 41: Using Ohm's Law (ESBQ8) We are now ready to see how Ohm's Law is used to analyse circuits. Ohm’s law is a simple empirical law that relates the conductivity in a material to the current density flowing through it. JEE Main 2013: Correct set up to verify Ohm’s law is: (A) Image A (B) Image B (C) Image C (D) Image D. Check Answer and Solution for above Physics q (a) I is directly proportional to V. Hence, straight line graph. By using the slider of rheostat take three different readings of current 1 and voltmeter V. Record your observations in the observation table. (a) A and B The value of resistance of the resistor in Ohm is (b) low resistance The intensity of the emergent light is, An ideal gas enclosed in a vertical cylindrical container supports a freely moving piston of mass $M$. (d) galvanometer, Question 3: Question 1: The ends of the wire may get corroded or some impurities may be deposited on it hence to remove the same and get correct readings the ends of the wire should be cleaned. The pointers of the ammeter and voltmeter should be at zero mark when no current flows through the circuit. (d) all of these, Questions based on Observational Skills In this experiment it is advised to take out the key from the plug when the observations are not being taken. When 1 joule of work is done to move a charge of 1 coulomb from one point to the other, then potential difference Ohm’s Law is named after George Simon Ohm a German physicist. Question 12: The solids which have negative temperature coefficient of resistance are : The energy equivalent of 0.5 g of a substance is: The Brewsters angle $i_b$ for an interface should be: Two cylinders A and B of equal capacity are connected to each other via a stop clock. In an electric circuit the key should be kept off to avoid: (d) 1 V and 1 A. While performing Ohm’s law experiment a student observed that the pointer of the voltmeter coincides with 15th division. It should be non-zero number. The least count of the voltmeter is Its density is :$(R = 8.3\,J\,mol^{-1}K^{-1}$). The instrument used to measure the potential difference is One coulomb is the amount of charge present on 6.25 x 1018 electrons. Аnswer: Using Circuit Simulators for Validating Ohm’s Law. (c) resistance This will allow you to verify Ohm’s law through simulation, verify Kirchoff’s laws, or calculate the transient behavior of the voltage and current in a circuit. Calculate the least count of voltmeter and ammeter correctly. • Construct a circuit using resistors, wires and a breadboard from a circuit diagram. (d) resistor and voltmeter. Question 1: Ohm's law states that the amount of electric current through a conductor in a circuit is directly proportional to the voltage across it. When the piston is in equilibrium, the volume of the gas is $V_0$ and its pressure is $p_0$. The graph of V and I is a straight line. (a) 1 Ω (a) remains unchanged (a) 10 In an electric circuit containing resistance, ammeter, key and battery, where will you connect voltmeter to verify Ohm’s law? (a) wrong connections The resistance of the conductor used in the experiment is: (d) joule, Question 5: (d) joule, Question 4: Question 32: The phase difference between displacement and acceleration of a particle in a simple harmonic motion is: A cylinder contains hydrogen gas at pressure of When the flow of current was studied it was assumed that the positive electricity is flowing from higher potential to lower potential. If the length of a given resistor is increased, what will happen to the overall resistance? Range of ammeter = AR……………………. 2 GΩ; Ohm’s law Quiz MCQs with Resistor Color Coding Technique. If the deflection takes place in opposite direction than the connections need to be checked and the terminals need to be interchanged. The entire system is thermally insulated. The approximate value of the resistor is: Question 21: Question 5: It is the property of a conductor to resist the flow of charges through it. Аnswer: The fringes obtained on the screen will be, A beam of unpolarized light of intensity $I_0$ is passed through a polaroid $A$ and then through another polaroid $B$ which is oriented so that its principal plane makes an angle of 45$^{\circ}$ relative to that of $A$. OHMS LAW . Connect the various components as. (d) 0.1 A. Resistance increases with increase in temperature of pure metals. (c) temperature of the wire In Ohm’s circuit which of the following does not have © and © terminals? Question 14: In a circuit ammeter is always connected in series and voltmeter is always connected in parallel. Close the sky, so that current begins to flow in the circuit. 2.2 APPARATUS REQUIRED: S. No Apparatus Name Range Type Quantity 1 RPS 2 Ammeter 3 Voltmeter 4 Resistor 5 Rheostat 6 Bread Board 7 Connecting Wires 2.3 CIRCUIT DIAGRAM: Fig – 2.1 Circuit Diagram 2.4 PROCEDURE: 1. Positive terminal of the battery is connected to the positive terminal of the ammeter. (d) Resistor, Question 18: (b) In series is ammeter, in parallel is voltmeter and Z is symbol of resistance. 2. What is the value of charge in 1 electron? In 1 coulomb 6.25 x 1018 electrons are present. CBSE Class 10 Science Practicals Lab Manual MCQ Аnswers: Physics Lab Manual CBSE Class 10 Scoring Key With Explanation, NCERT Solutions for Class 6 Social Science History Chapter 2 On the Trial of the Earliest People. To study the dependence of the current (I) on the potential difference (V), across a resistor, two students used two set-ups shown in figures (A) and (B) respectively. 3 Digital multimeter. Аnswer: The current flowing through a conductor and the potential difference across its two ends are as per reading of the ammeter and the voltmeter shown below. What is coulomb? Question 8: (c) (d) in set-up (A) and (a) in set-up (B). Define potential difference. Voltmeter should always be connected in parallel to resistor. Heating may change the resistance of resisters. 1 electron = 1.6 x 10-19C. (b) 0.075 V In the given circuit diagram, the components connected in series are: (a) voltmeter (b) resistor and voltmeter Ohm’s Law 2.1 Objectives • Become familiar with the use of a digital voltmeter and a digital ammeter to measure DC voltage and current. For the circuits shown in figures I and II given below, the ammeter reading is 1A so the voltmeter reading would be: To help us understand the the relationship between the various values a little further, we can take all of the Ohm’s Law equations from above for finding Voltage, Current, Resistance and of course Power and condense them into a simple Ohms Law pie chart for use in AC and DC circuits and calculations as shown. In the experiment if the deflection on ammeter or voltmeter scale goes beyond the full scale than the device needs to be replaced with the one which can measure higher current and voltage. Voltmeter will be connected parallel to the resistance. Question 28: 3. Question 25: Question 2: The area of cross-section of the resistor. B. the voltmeter was not correctly connected in the circuit It is measured by a device called ammeter which is always connected in series in a circuit. On x axis take V and on y axis take I. Least count of voltmeter = = ………………. (c) cross-sectional area of wire Correct answer: 4. (c) no reading in the ammeter but a finite reading in the voltmeter. 4. (a) Reading = Least count x Division of reading. (c) incorrect readings The given graph, is plotted for V-I to verify Ohm’s law. Аnswer: A student arranged an electric circuit as shown below: ∴ R1 should be parallel to voltmeter & R2 should be series with ammeter. (b) ammeter and resistor This verifies Ohm’s law. (c) 2 V and 1 A Question 2: The best graph plotted by a student for Ohm’s experiment is: Question 39: Here comes a proportionality constant (1/R) and the Ohm’s law equation becomes, I = (1/R) V => I = V/R or, V = IR ………………. (b) 0 A in both the cases What is the unit of current and how do we measure current flowing through a wire? (c) ohm What is the least count? (d) 0.250 V. Question 10: Question 17: (d) 1 A in circuit I and 1 A in circuit II. (b) 1 V and 2 A (c) ammeter and rheostat Here you can perform simple experiments remotely from home or elsewhere using resistors and instruments located in an instructional laboratory at Blekinge Institute of Technology in Sweden. (c) ohm The electric potential at the point O lying at distance L from the end A is. Suggest the material needed to him to do the related activity. Just enter 2 known values and the calculator will solve for the others. (b) Secondary cells can be recharged using a charger. 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