Verification of Ohm’s Law for a Resistor

To verify Ohm’s Law for a given resistor.

• To measure voltage and current using a voltmeter and ammeter.
• To calculate the resistance from experimental data.
• To plot the V–I characteristic curve and observe linearity.

• DC Power supply (0–12 V)
• Resistors of known resistance (1 Ω – 1 kΩ)
• Ammeter (0–1 A)
• Voltmeter (0–15 V)
• Connecting wires and crocodile clips
• Breadboard or test circuit setup

Circuit Setup:

• Connect the resistor in series with the ammeter.
• Connect the voltmeter across the resistor.
• Ensure proper polarity for DC measurement.

Applying Voltage:

• Gradually increase the supply voltage in small steps.
• Record the corresponding current (I) for each voltage (V) reading.

Repeat Measurements:

• Take at least 5–7 readings for different voltage levels.
• Ensure that the resistor does not overheat.

Calculations:

• Calculate the resistance using
  $$ R = \frac{V}{I} $$
  for each measurement.
• Compute the average resistance.

Plotting V–I Curve:

• Plot Voltage (V) on the y-axis and Current (I) on the x-axis.
• A straight line through the origin confirms Ohm’s Law.