An electric toaster is connected to the 230 V230\text{ V}230 V mains supply. The power of the toaster is 1100 W1100\text{ W}1100 W.
A power of 1100 W1100\text{ W}1100 W is the same as:
State the equation linking power, current, and voltage.
Show that the current in the toaster is about 5 A5\text{ A}5 A.
The toaster is earthed and fitted with a fuse. Explain how the earth wire and fuse protect the user if there is a fault where a live wire touches the metal case.
Another toaster has twice as much power. It is connected to the same 230 V230\text{ V}230 V mains supply. Which of these fuse ratings should be used for this toaster?
A student has a pack of fuses labelled 3 A3\text{ A}3 A. Explain how they could test one of these fuses to check that the 3 A3\text{ A}3 A rating is correct.
