A 6 ohm heater is connected to a 12 V supply. What power does it dissipate?
Answer and explanation
Correct answer: B. 24 W
- Step 1: .
- Step 2: W.
Answer
24 W.
Why not the others: 2 W: this is the current, not the power. 72 W: V and R were multiplied. 12 W: the result was halved.
Practise more Electricity and magnetism.
Free questions with an explanation for every one, and full timed Wazari Exam (Iraq Baccalaureate) - Scientific Branch mock tests.
More Electricity and magnetism questions
- A 9 V battery is connected across a 3 ohm resistor. What current flows?
- A 10 ohm and a 15 ohm resistor are connected in parallel. What is the combined resistance?
- A cell of e.m.f. 12 V and internal resistance 1 ohm is connected to an external resistor of 5 ohm. What is the potential difference across t…
- A cell of e.m.f. 24 V and internal resistance 2 ohm is connected to an external resistor of 10 ohm. What is the potential difference across…
- A cell of e.m.f. 20 V and internal resistance 2 ohm is connected to an external resistor of 8 ohm. What is the potential difference across t…
- A 50 ohm heater is connected to a 100 V supply. What power does it dissipate?