A current of 0.5 A flows through a 6 Ω resistor. What is the potential difference across it?
Answer and explanation
Correct answer: A. 3 V
- Step 1: Ohm's law: .
- Step 2: V.
Answer
3 V.
Why not the others: 12 V: it divides resistance by current. 6.5 V: it adds the numbers. 0.083 V: it divides current by resistance.
Practise more Electricity and Magnetism.
Free questions with an explanation for every one, and full timed HKDSE (Hong Kong) mock tests.
More Electricity and Magnetism questions
- A current of 4 A flows through a 10 Ω resistor. What is the potential difference across it?
- A current of 4 A flows through a 12 Ω resistor. What is the potential difference across it?
- A current of 3 A flows through a 10 Ω resistor. What is the potential difference across it?
- A 4 Ω resistor and a 12 Ω resistor are connected in parallel. What is the total resistance?
- Resistors of 4 Ω, 6 Ω and 4 Ω are connected in series. What is the total resistance?
- Resistors of 6 Ω, 3 Ω and 4 Ω are connected in series. What is the total resistance?