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.

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