Capacitance and energy storedEdexcel A-Level Physics: Mind map

Exam questions on Capacitance and energy stored

1. A 2200 μF capacitor is connected across a 9.0 V supply and allowed to charge fully.
   Calculate the charge stored and the energy stored when the capacitor is fully charged.2 marks
2. The flash unit of a camera uses a capacitor of capacitance 120 μF, which is charged to a potential difference of 330 V before the flash is fired.
   Calculate the energy stored in the capacitor at 330 V.2 marks
3. A memory-backup circuit uses a 0.47 F capacitor charged to 5.0 V. When the supply fails, the capacitor powers a data logger that needs a potential difference of at least 3.0 V across it to work. While it works the logger transfers energy at a constant 0.80 W.
   Calculate the energy stored in the capacitor and the charge stored on it when it is fully charged.3 marks