Two resistors of 10 and 20 ohms are connected in parallel. If power dissipated in 10 ohms resistor is 10 watts, then power dissipated in 20 ohms resistor is

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Two resistors of 10 and 20 ohms are connected in parallel. If power dissipated in 10 ohms resistor is 10 watts, then power dissipated in 20 ohms resistor is:

  1. 2.5 watts
  2. 5 watts
  3. 10 watts
  4. 20 watts

Correct answer: 2. 5 watts

Voltage across 10 ohms resistor can be calcualted from formula:

V2=P*R = 10 W * 10 ohms = 100 V

Or V = 10 V

Since both are in parallel 20 ohms resistor also has 10 volts across it

P = V2/R = 100/20 = 5 watts

So option 2 (5 watts) is the correct answer.

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