potential difference (voltage) and resistance

Potential difference (voltage)

A measure of the amount of energy given to the charge carriers (electrons) in a circuit

E \= QV

The equation linking energy transferred, charge flow and potential difference

E

The symbol for energy transferred

Q

The symbol for charge flow

V

The symbol for potential difference

Joules (J)

The SI unit for energy and work

Coulombs (C)

The SI unit for charge flow

Volts (V)

The SI unit for potential difference

1 volt is equal to

The potential difference when one coulomb of charge transfers one joule of energy (1 V \= 1 J/C)

V \= IR

The equation linking potential difference, current and resistance; also known as Ohm's Law

Current

The rate of flow of electric charge (electrons) around a circuit

Resistance

The opposition to the movement of electric current through a material

I

The symbol for current

R

The symbol for resistance

Amps/amperes (A)

The SI unit for current

Ohms (Ω)

The SI unit for resistance