## Sunday, 21 September 2014

### CHOOSING FUSES PROBLEMS

1.       What would happen if we used a 3A fuse for a fan heater that normally needs 8 Amps?

2.       Why is it a bad idea to use a 13A fuse for a bedside lamp that only needs 0.2A under normal conditions?

3.       An electric heater uses 4A when running. Would you fit it with a 3A, 5A or 13A fuse?

4.       A garden floodlight has a 480W bulb, and runs on 230V.

(a) How much current does it need?

(b) Would you fit it with a 3A, 5A or 13A fuse?

5.       An electric shaver uses 40W of power, and runs on 230V

(a) What current does it need?

(b) Given a choice of 1A, 3A, 5A or 13A fuses, which would you use?

6.       What fuse would you put into a 1000W 230V iron 3A, 5A, 9A or 13A?

7.       What fuse would you put into a 2500W 230V Cooker 3A, 5A, 9A or 13A?

8.       Why can you not use a 3000W oven in a normal socket?

9.       Our main hall lighting rig contains 8 x 1,000W lamps, 6 x 1,200W, 6 x 600W, 12 x 650W and 15 x 500W.

(a) When all the lamps are faded up, what is the total power?

(b) Would a 150A fuse be enough to run the system?