Question

Three equal resistors connected in series, across a
source of emf, dissipate 10W of power. What would be
the power dissipated when they are connected in
parallel across the same source:
(1) 10W (2) 30W
(3) 90W (4) 270W

Answer 1

3) 90 W

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Answer 2

power dissipated =

${v}^{2} \div r \div 3$

$3 {v}^{2} \div r$

=3×30W

=90W