What is the nominal voltage of the mains electricity supply in the UK? State both the value and the unit.
An industrial high-pressure steam cleaner is connected to the UK mains electricity supply. For safety reasons, it features two separate controls: a trigger switch on the spray wand handle and a safety switch on the main body of the machine. \nThe\nThe\nThe circuit diagram for the steam cleaner is shown below.
\nThe\nThe\nThe motor in the steam cleaner can only be turned on when the operator holds both the spray wand trigger and the body safety switch down at the same time. Explain why.
The electrical power input to the motor is 1.6 kW1.6\text{ kW}1.6 kW. The internal resistance of the motor is 25 Ω25\ \Omega25 Ω. Calculate the current in the motor.
The useful power output from the motor is 1.2 kW1.2\text{ kW}1.2 kW. Calculate the time it takes for this motor to transfer 720 000 J720\,000\text{ J}720000 J of useful energy.
Domestic uses and safety Questions
Practise AQA GCSE Physics Domestic uses and safety with exam-style questions for Foundation and Higher tier. 13 questions covering Direct and alternating potential difference and Mains electricity, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.