| Name | Symbol | Unit | Definition | |
| Voltage | V | Volts (V) | A representation of the electric potential energy per unit charge. | |
| Current | I | Amperes (A) | The total amount of charge moving past a point in a conductor, divided by time taken. | |
| Resistance | R | Ohms (Ω) | A measure of the opposition to current flow. | |
| Power | P | Watts (W) | The rate at which work is done. | |
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