Ohm's Law
Objectives:
At the end of this exercise you shall be able to :
👉 Verify the relation between voltage and current when resistance is constant
👉 Verify the relation between current and resistance when keeping voltage is constant
👉 Plot the graph in both conditions illustrating the behavior of current with respect to resistor
There is two method to perform ohm's law in lab
1) By keeping constant Resistance and varying Voltage.
2) By keeping constant Voltage and varying Resistance.
1) By keeping constant Resistance and varying Voltage.
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| fig |
✔ Check the voltmeter.
✔ Check the ammeter.
✔ Identify the fixed and variable terminals of the rheostat.
✔ Connect the circuit elements as shown in Fig.
✔ keeping the variable rheostat at the minimum value.
✔ Apply different voltages by varying the rheostat arm of the potential divider in succession across the resistance.
✔ Measure the voltage and the corresponding current.
✔ Record the measured values in below Table.
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| Table |
✔ Refer the recorded value and plot a graph. V in Y Axis; I in X axis as shown in below Fig
✔ Calculate value of R .
✔ Calculate value of R .
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| fig |
2) By keeping constant Voltage and varying Resistance.
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| Fig |
✔ Connect the circuit elements as shown in Fig with 0 -1A ammeter. Adjust V at 12 volts keep it constant.
✔ Connect 10Ω resistance as shown in fig
✔ Close the switch ‘S’ and measure the current and voltage.
✔ Read the voltage and current reading . and note down in below table
✔ Now connect 20 Ω resistance and measure voltage and current. note down reading in table
✔ Repeat this for different value of resistance.
✔ Open the switch (OFF). Change the ammeter to 0-500 mA for 50 and above value resistance.
✔ Refer the recorded value and plot a graph. V in Y Axis; I in X axis as shown in below Fig
✔ Calculate value of R .
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| fig |
Conclusion :
Write your findings and conclusion by interpreting the current and resistance.
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