Fig. 9.1 shows an electric water heater, and the heater is connected to the mains electrical supply.
(a(i))[1]
Explain why the safety label says, ‘Disconnect from the mains supply before removing the plastic cover.’
(a(ii))[3]
Calculate the current in the heater. Use the information in Fig. 9.2.
(b)[3]
Calculate the cost of using the heater from 1st October until 31st October.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “To stop the risk of electric shock / electrocution” …