Lecture notes
Flashcards for 21.1 Capacitance
- Institution
- OCR
Flashcards for 21.1 Capacitance
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Q: CapacitorsA:
Capacitors are electrical components in which charge is separated
They come in a variety of shapes and sizes
However, their basic construction is the same
A capacitor consists of two metallic plates separated from each other by an insulator,
often known as a dielectric
You can easily make your own capacitor from two sheets of aluminium foil separated
by a newspaper
Q: Capacitor dielectric examples
A:
Air
Paper
Ceramic
Mica
Q: Circuit symbol for a capacitor
A:
Q: Storing charge
A:
When the capacitor is connected to the cell, electrons flow from the cell for a very
short time
They cannot travel between plates because of the insulation
The very brief current means electrons are removed from plate A of the capacitor and
at the same time electrons are deposited onto the other plate B
Plate A becomes deficient in electrons, that is , it acquires a net positive charge
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