A 10 μF capacitor is charged to 12 V. How much energy does it store?
Answer and explanation
Correct answer: D. 720 μJ
- Step 1: .
- Step 2: μJ.
Answer
720 μJ.
Why not the others: 1440 μJ: the factor is missing. 60 μJ: the voltage is not squared. 120 μJ: that is the charge, not the energy.
Practise more Electricity and Magnetism.
Free questions with an explanation for every one, and full timed Leaving Cert Ireland mock tests.
More Electricity and Magnetism questions
- A current of 0.5 A flows through a 12 Ω resistor. What is the potential difference across it?
- Resistors of 2 Ω, 12 Ω and 12 Ω are connected in series. What is the total resistance?
- Resistors of 2 Ω, 3 Ω and 4 Ω are connected in series. What is the total resistance?
- A 2 μF capacitor is charged to 100 V. How much energy does it store?
- A rod of length 0.2 m moves at 10 m/s perpendicular to a magnetic field of 0.5 T. What emf is induced between its ends?
- A 24 V battery of negligible internal resistance is connected to a 1 Ω resistor in series with a parallel pair of 6 Ω and 3 Ω resistors. Wha…