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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
