UPSC 2017 CDS I GK Paper

The power dissipated in the second case will be 3P
When one resistor is connected, the equivalent resistance is REQ = R.
So, power dissipated =

V2

R

=P.
But, if the three equal resistors are connected in parallel, the equivalent resistance is REQ=

R

3

Power for the parallel combination is =3×(

V2

R

)=3×P
Hence, the parallel combination dissipates 3 times the power of the simple combination