Lesson: Calculating the Energy Stored in a CapacitorPhysics
In this lesson, we will learn how to relate the charge stored in and the voltage applied across a capacitor to the energy stored in it.
Sample Question Videos
A capacitor has a charge of 2.5 µC when connected to a battery of 6.0 V. How much energy is stored in this capacitor?
A 165 µF capacitor is used in conjunction with a dc motor. How much energy is stored in the capacitor when 119 V is applied?
Electronic flash units for cameras contain a capacitor for storing the energy used to produce the flash. In one such unit, the flash lasts for s, with an average light power output of 270 kW.
If the conversion of electrical energy to light is efficient (because the rest of the energy goes to thermal energy), how much energy must be stored in the capacitor for one flash?
What is the capacitance of the capacitor if the potential difference across its plates is 125 V when it stores enough energy for one flash?