PHYS - Electricity Hazards and Safety
Physics, electricity, fuse, double insulation - IBDP | DSE | GCE | IAL | AP Physics
Electricity is a very useful energy used in our everyday lives, but it can also act as a hazard!
You should be able to identify some safety measures for IGCSE Physics 😁
Structure of Plug
The inside of a plug looks like this 👇
Fuse and Circuit Breaker
A washing machine has an electric motor and an electric heater. The resistance of the motor is 22Ω. The mains voltage is 230V.
(a) Show that the current in the heater is about 10A when it is working.
V = IR
I = V / R
I = 230 / 22 = 10.45A ≈ 10A
(b) When the motor is working, the current in it is 1.74A. Explain why it would not be sensible to replace the 13A fuse with a 2A fuse.
→ The total current needed by the motor and heater is approximately 12A. If you use a 2A fuse, the fuse would melt at 2A and break the circuit, and the washing machine will not operate. It is sensible to use a 13A fuse, which is slight over the current needed by the washing machine.
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