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Use of Capacitors

Capacitors are used in
  • smoothing circuits e.g. when converting a.c. to d.c.
  • camera flashes to store and then suddenly release charge in a short period of time
  • back-up power supplies
  • timing circuits that switch on and off automatically
  • filter circuits to remove unwanted frequencies
  • tuning circuits to select radio/TV channels.

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Specification: OCR Physics A (H556), A-level, 6.1.1 Capacitors and 6.1.2 Energy. Topic: Capacitors.

Key terms in this lesson

field line
A line showing the direction of the force that would act on a small test mass or charge placed at that point in a field.
magnetic field
A region of space in which a moving charge, current-carrying conductor or magnetic material experiences a force.

More in Capacitors

All 12 lessons in Capacitors · All OCR A-level Physics topics