Question

Five equal resistors when connected in series 15
dissipated 5 watt power. If they are connected
in parallel, the power dissipated will be​

Answer 1

Assume voltage is 5 and each resistor is 1 ohm

When all 5 resistors connected in series total resistance is 5 ohms

Power dissipated in all resistors is $\large \frac {v^{2}}{r} = \frac {25}{5} =5w$

If all connected in parallel resultant resistance is $\large \frac {1}{5}$ =0.2 ohms

Power dissipated is 25/0.2=125 watts