An industrial espresso machine has a high-pressure water pump and a boiler heating element.
The resistance of the boiler heating element is 20 Ω20\ \Omega20 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 boiler heating element is 11.5 A11.5\text{ A}11.5 A when it is working.
The espresso machine is fitted with a fuse rated at 13 A13\text{ A}13 A.
Explain why the espresso machine is fitted with a fuse.
When the water pump is working, the current in it is 1.0 A1.0\text{ A}1.0 A.
Explain why it would not be sensible to replace the 13 A13\text{ A}13 A fuse with a 10 A10\text{ A}10 A fuse.