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Physics A-level Paper 2 > Capacitance > Flashcards

Flashcards in Capacitance Deck (7)
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1
Q

Define 1 Farad.

A

the capacitance when 1V appears across a capacitor’s plates when a charge of 1C is stored.

2
Q

What is capacitance?

A

the ability of a body to hold an electric charge

3
Q

What is a capacitor made up of?

A

2 metal sheets rolled up with an insulator between the, (called the dielectric).

4
Q

Why is there an insulator within a capacitor?

A

to stop charge conducting between them

5
Q

How do you calculate charge of a capacitor?

A

Q = CV

6
Q

What is the time constant?

A

RC, the time constant controls how quickly a capacitor will discharge

7
Q

What is the relative permittivity of a dialectric.

A

the ability of the substance to store electrical energy in an electric field, relative to its surroundings