# Practical resistors

### Explanation of question 5

A 47 resistor takes a current of 100mA. Its preferred power rating should be of a value at least

1. 1/2W
2. 1/4W
3. 1/8W
4. 1/10W

The answer is :- 1 Power = I2 x R = 0.12 x 47 = 0.47W. Preferred power rating should be above this, i.e. 0.5 W.

BACK

page (tq0405ex)
Some material Copyright John Bowyer G4KGS.
Click here for important Copyright information
Web Space provided by Hostroute.com Ltd
Contact details