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Energy Transfers In Everyday Appliances (GCSE Physics)

The following is a GCSE Physics test covering 'Energy Transfers In Everyday Appliances' from the broader topic Electricity. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

Why do most electric heaters waste some input energy as thermal energy to the surroundings?
A household mains supply in the UK provides alternating electricity at which potential difference?
A hairdryer converts electrical energy to thermal and kinetic energy. Which of these is the wasted energy in normal use?
Which formula gives efficiency when you know useful energy output and total energy input?
Why might smart meters and energy-efficient appliances together reduce household energy use?
A 0.5 kg electric toaster contains a heating element that increases temperature by 100 °C. Which formula and data are needed to calculate energy transferred to the element as internal energy?
An energy-efficient appliance has a higher or lower useful energy output fraction compared with a less efficient one?
What is the best description of what a watt (W) measures?
Why are LED lamps often more energy efficient than incandescent filament bulbs?
What is the purpose of a step-down transformer in a power distribution system near homes?
A 2.0 kW kettle is switched on for 3 minutes. Which expression gives the electrical energy it uses (in joules)?