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01. Ohm's Law — V-I Characteristics

Physics Normal

Aim

To study the dependence of potential difference (V) on the electric current (I) flowing through a resistor and determine its resistance. Also, to plot a V-I graph.

Materials Required

Battery
Ammeter
Voltmeter
Resistor
Rheostat
Switch/Key
Connecting Wires

Procedure

  1. Connect the circuit as shown in the simulation diagram.
  2. Insert the key and adjust the rheostat to get the minimum reading.
  3. Note the ammeter and voltmeter readings.
  4. Change the rheostat position to get different readings.
  5. Record at least 6 readings in the observation table.
  6. Plot a V vs I graph and observe its nature.

Precautions

  • Connect the ammeter in series and the voltmeter in parallel.
  • Use thick connecting wires to minimize wire resistance.
  • Do not pass current for long periods to avoid heating the resistor.
  • Start with a low voltage to prevent damage to the components.
VOLTAGE (V)
0.00
CURRENT (A)
0.00

Observation Table

S.No. Voltage (V) Current (A) V/I (Ω)

V-I Graph

The graph is a straight line passing through the origin, which verifies Ohm's Law.

📹 Video Tutorial

💡 Watch this video to see how the experiment is performed in a real lab.

Experiment Quiz

Test your understanding of Ohm's Law.

1. Ohm's law states that:

2. The slope of V-I graph gives:

3. If resistance is doubled keeping voltage constant, current:

4. Ammeter is connected in:

5. The SI unit of resistance is:

Experiment Report: Ohm's Law

Aim: To study the dependence of potential difference (V) on the electric current (I) flowing through a resistor and determine its resistance. Also, to plot a V-I graph.

Recorded Observations

S.No. Voltage (V) Current (A) V/I (Ω)
No readings recorded yet. Complete the simulation first.

Result

The V-I graph is a straight line passing through the origin, verifying Ohm's law.

The average resistance of the given resistor = ___ Ω