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Cambridge IGCSE Physics practice

Paper 3 structured question: Electrical energy and electrical power

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Electrical energy and electrical power

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Paper 3Theory (Core)4 marks

Calculating energy costs for household appliances.

Description

Energy Consumption of Appliances

A washing machine has a power rating of 2 kW and is used for 1.5 hours. The cost of electricity is $0.12 per kWh.

  1. a

    Calculate the energy consumed by the washing machine in kWh.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Calculate the cost of running the washing machine for this duration.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Electrical energy and electrical power

Paper 3Theory (Core)4 marks

Description

Energy Usage of a Refrigerator

A refrigerator uses 0.2 kW of power and operates continuously for 24 hours. The cost of electricity is $0.15 per kWh.

  1. a

    Calculate the total energy consumed by the refrigerator in kWh over one day.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Calculate the cost of running the refrigerator for one day.

    Aim for approximately 2 distinct marking points.

    [2]