Identify which of the following would be the most appropriate choice of fuse for a 1200W kettle operating on UK mains electricity (230V). A) 3A Fuse B) 5A Fuse C) 10A Fuse D) 13A Fuse
The answer is C) 10A Fuse.To calculate the current flowing to the kettle, you use the P=IV equation to work out that I=P/V. Putting P = 1200 and V = 230 into this equation gives I = 1200/230 = 5.217A. Therefore, any fuse labelled at less than or equal to 5.217A will blow when the kettle is operating, meaning the chosen fuse must be greater than 5.217A.Fuses are a safety device designed to prevent too much current flowing through a device. Therefore, you want the current labelled on the fuse to be above the current expected to flow through the device, but not too much above. In this case, 13A is too far above the expected current of 5.217A to be an appropriate choice. This leaves you with only one option - the 10A fuse - which is above the expected current, but still close enough to it to function as a safety device, making it the most appropriate choice.
Related Physics GCSE answers
All answers ▸If Newton's 3rd law is true (all actions have an equal and opposite reaction), then how can any object move?
A student is investigating how the pressure exerted by a gas varied with the volume of the gas. The initial pressure was 1.6x10^5 Pa, with the volume being 9.0cm^3. Calculate the volume of the gas when the pressure was 1.8x10^5 Pa
When a toothbrush is charging, p.d. across the primary coil is 230 V, p.d. across the secondary coil is 7.2 V. The primary coil in the charging base has 575 turns of wire on its coil. Find the number of turns on the secondary coil inside the toothbrush.
Waves on the surface of water are transverse waves. State one other example of a transverse wave.