K223 / K224 / 2027

Chapter 12

Practical electricity

Appliance energy use and protection depend on the power, operating time and circuit connections.

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  1. Electrical heating and power

    Connect electrical input to heating, and calculate power and energy from matching readings.

  2. Energy use and cost

    Use kW h, operating time and a supplied tariff to calculate an appliance cost.

  3. Live, neutral, earth and the plug

    Identify the conductors and plug parts, and explain why a switch interrupts the live connection.

  4. Hazards and protective devices

    Explain damaged-insulation, overheating and damp-condition hazards, then trace how protection works.