Electric currents

Potential difference – definition – energy difference per charge

Electron volt – energy needed to move one electron across one volt of potential difference

Current – rate at which charge flows

Resistance – ratio of potential diff to current

Resistance in a wire

Ohm’s Law

Ohmic vs non-ohmic (filaments)

Power dissipation

Electromotive force – terminal voltage when no current flows

Internal resistance

Resistors in series and parallel

Circuit diagrams

Kirchoff

Ammeter and voltmeters – resistance and placement

Potential divider

Sensors

LDRs

Thermistors