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Flashcards for 21.3 Energy Stored by Capacitors
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Flashcards for 21.3 Energy Stored by Capacitors
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Q:A:
This shows an electron moving towards the negative plate of a capacitor that is being
charged
This electron will experience a repulsive electrostatic force from all the electrons
already on the plate
External work has to be done to push this electron onto the negative plate
Similarly, work is done to cause an electron to leave the positive plate of the capacitor
The external work is provided by the battery of power supply connected to the
capacitor
In short, the energy stored in a capacitor comes from the energy of the batter or
power supply
Q: A p.d - charge graph
A:
Q: How can you determine the energy stored in a capacitor
A:
A graph of p.d against charge for a capacitor
Work done = p.d x charge
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