What is the nominal voltage of the mains electricity supply in the UK? State both the value and the unit.
An industrial meat mincer is connected to the mains electricity supply. It has a safety switch on its protective lid and another safety switch on the feed-chute.
Figure 1 shows the electrical circuit diagram for the meat mincer.
The motor in the meat mincer can only operate when the protective lid is securely closed and the feed-chute is locked in place. Explain why.
The power input to the motor is 2.45 kW. The resistance of the motor is 50 Ω. Calculate the current in the motor.
The useful power output from the motor is 1.4 kW. Calculate the time it takes for the motor to transfer 420,000 J420,000\text{ J}420,000 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.