An electric kettle is rated at 2 kW when connected to a 230 V electrical supply a Calculate the current when the kettle is turned on.

b What value fuse should be included in the circuit of the kettle?
(Assume that the fuses available are 3 A, 5A and 13 A.)

c Modern kettles often have double insulation. Explain what this means
and how it provides extra safety for the user.

d ) Calculate the resistance of the heating element of the kettle.

Explanation:

a) P = IV

2000 W = I (230 V)

I = 8.7 A

b) The fuse must be rated for a higher current than the kettle, so use the 13A fuse.

c) Double insulation means there are two layers of insulation, insuring that the wires cannot touch the outer casing of the kettle and protecting the user from electrical shock.

d) V = IR

230 V = (8.7 A) R

R = 26.5 Ω

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible