Physics Experiments / Ohm's Law

Ohm's Law Experiment

Study the relationship between voltage, current, and resistance in an electrical circuit.

Physics Class 9-10 Electricity Intermediate
Prelab Brief
To verify Ohm's Law — V = IR — and study the linear relationship between voltage and current for a given resistor.
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Theory

Study the relationship between voltage, current, and resistance in an electrical circuit. To verify Ohm's Law — V = IR — and study the linear relationship between voltage and current for a given resistor.

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Formula

V = IR

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Aim

To verify Ohm's Law — V = IR — and study the linear relationship between voltage and current for a given resistor.

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Apparatus

  • Battery / DC power supply
  • Ammeter
  • Voltmeter
  • Rheostat / Variable resistor
  • Connecting wires
  • Resistor (known value)
  • Key / Switch
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Procedure

  1. Connect the circuit: battery → key → ammeter → resistor → battery.
  2. Connect the voltmeter in parallel across the resistor.
  3. Close the key and note the ammeter and voltmeter readings.
  4. Vary the resistance using the rheostat to get different readings.
  5. Plot V vs I graph — it should be a straight line through origin.
Pre-Lab Questions
What is the main aim of the Ohm's Law Experiment?
Which principle is demonstrated in the Ohm's Law Experiment?
What apparatus is required for this experiment?
Why is Battery / DC power supply used in this experiment?
What formula or relationship is verified in this experiment?
What precaution should be followed while performing this experiment?
What conclusion can be drawn from the Ohm's Law Experiment?

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