An electric dishwasher has a water pump motor and an electric heater.
The resistance of the heater is 30 Ω30\ \Omega30 Ω.
The mains voltage is 230 V230\text{ V}230 V.
State the equation linking voltage, current, and resistance.
Show that the current in the heater is about 7.7 A7.7\text{ A}7.7 A when it is working.
The dishwasher is fitted with a fuse rated at 10 A10\text{ A}10 A.
Explain why the dishwasher is fitted with a fuse.
When the pump motor is working, the current in it is 1.2 A1.2\text{ A}1.2 A.
Explain why it would not be sensible to replace the 10 A10\text{ A}10 A fuse with a 5 A5\text{ A}5 A fuse.