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National 4

Charge and current

Current is a flow of electrical charge. Voltage measures the energy carried by the charge flowing in a circuit. This electrical energy is transferred in the circuit into light, heat and movement.

Part of
Physics
Electricity
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Circuit symbols

Switch, Cell, Battery, Lamp, Voltmeter, Ammeter, Resistor, Variable resistor, Capacitor, Diode and Fuse.

These symbols are used so that everyone worldwide can understand a circuit diagram when they see it.

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More Guides

  1. Generation of electricity
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  2. Electrical power
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  3. Electromagnetism
    next
  4. Charge and current
  5. Series and parallel circuits
    next
  6. Applications of series and parallel circuits
    next

2022 exam changes

All the advance information and revision support for this year’s examinations.

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