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Electricity and Magnetism
Quick questions on Capacitance and energy storage explained: H2 Physics Electricity and Magnetism
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is energy stored on a capacitor?Show answer
As a capacitor charges, work is done against the increasing voltage to add more charge. The energy stored is the area under a charge-voltage graph (a triangle):
What is capacitors in parallel?Show answer
Capacitors in parallel share the same voltage, and their charges add, so the capacitances add:
What is capacitors in series?Show answer
Capacitors in series carry the same charge, and their voltages add, so the reciprocals add:
What is q1?Show answer
Define capacitance and state its SI unit. [2 marks]
What is q2?Show answer
A capacitor is charged to . Find the energy stored. [2 marks]
What is q3?Show answer
Two capacitors are connected in series. Find the combined capacitance. [2 marks]
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