- Designed to store charge, similar to a cell
- Two metal plates seperated by a insulator, i.e. ceramic, plastic
-When connected to a battery/cell, electrons are moved from the left plate and deposited on the right plate.
- Plate charges become +Q and -Q
- Full charge is achieved when capacitor p.d.=cell e.m.f.
- Q on a plate is directly proportional to p.d. across it, so Q=VC (where C is capacitance)
- Capacitance (measured in Farads, F) is:- The charge stored per unit p.d.
- 1 farad = 1 coulomb per unit volt
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