Two identical resistors, each of resistance 20Ω are connected (i) in parallel (ii) in series, in turn,
to a battery of 10 V. Calculate the ratio of power consumed in the combination of resistors in the
two cases.

Question

Two identical resistors, each of resistance 20Ω are connected (i) in parallel (ii) in series, in turn,
to a battery of 10 V. Calculate the ratio of power consumed in the combination of resistors in the
two cases.

anonymous · Answer

P = VI

anonymous · Answer

so... we need to determine the current for each of these circuits.

anonymous · Answer

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anonymous · Answer

in series, you add up the resistors and that equals a single resistor. 20+20 = 40

anonymous · Answer

V = IR 
and
p=vi
can you take it from here for series?