All mind maps topics

Electrical power and safetyIB MYP Sciences: Mind map

What this mind map covers

  • Power
  • Energy and cost
  • Mains plug
  • Safety devices
  • Static electricity
  • Exam tips

Exam questions on Electrical power and safety

  1. A family in Dubai uses an electric kettle rated at 2.0 kW. The kettle works from the 230 V mains supply.
    Calculate the energy transferred by the kettle in 3.0 minutes, in kilowatt-hours.2 marks
  2. A household in Auckland pays 30 cents for each kilowatt-hour (kWh) of electricity. A 1.5 kW electric heater runs for 4.0 hours each evening.
    Calculate the cost of running the heater for one evening.2 marks
  3. A washing machine in a home in Cairo is connected to the mains supply by a three-pin plug that contains a fuse. The machine has a metal case and is rated at 2300 W on the 230 V mains.
    Explain how the earth wire and the fuse together protect a user if a fault makes the live wire touch the metal case.3 marks
See the full worksheet

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).