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A resistor of 10 kilohm carries a current of 20 mA. The power dissipated in the resistor is:

  a.   2 watt

  b.   4 watt

  c.   20 watt

  d.   40 watt
Your answer "b" is CORRECT!

P = I squared x R
= 0.02 x 0.02 x 10,000
= 4 watts.

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