Virtual Physics Lab β Experiment 2
Ohm's Law: Verify V = IR using a Circuit Builder
Aim: To verify Ohm's Law by studying the relationship between potential difference (V) across a resistor and the current (I) through it, and to determine the unknown resistance experimentally.
Battery (EMF)
2 V
Rheostat Setting
10 Ξ©
Test Resistor (Unknown)
? Ξ©
Interactive Circuit
Series Circuit: Battery β Rheostat β Ammeter β Resistor
1. Battery EMF (Voltage):2 V
1 V12 V
2. Rheostat Resistance:10 Ξ©
0 Ξ© (max current)50 Ξ© (min current)
Voltmeter (V across R)
1 V
Ammeter (I)
0.1 A
V Γ· I (computed R)
10.0 Ξ©
Observations
0 / 6
Lab Ledger
Observation Table & V-I Analysis
| S.No. | Rheostat (Ξ©) | Voltmeter V (V) | Ammeter I (A) | V/I = R (Ξ©) |
|---|---|---|---|---|
| Adjust voltage and rheostat, then click Record Observation. | ||||
Oral Viva Examination
Concept Verification & Viva Questions
1. State Ohm's Law in words.
2. In a V-I graph for an ohmic conductor, what does the slope of the graph represent?
3. If a wire of resistance 5 Ξ© carries a current of 2 A, what is the potential difference across it?
4. Which instrument measures the potential difference in a circuit and must be connected in parallel?
5. What is the effect on resistance when the length of a metallic wire is doubled?