- Electrical current is a measure of the rate at which charge flows around a circuit. I = Q/t .
- In a simple lighting circuit, this charge is carried by electrons which move around the circuit.
- Each electron carries 1.6 x 10-19 Coulombs of negative charge.
- The voltage produced by the battery causes the current to flow, the larger the voltage, then the larger the current will be.
- The resistance of the cct restricts the amount of current that flows. The larger the resistance, then the smaller the current will be.
- This relationship is described by Ohm's law, I = V/R.