Question

➡️For Physics Newton's⬅️

The electric power consumed by a device may be calculated by using either of the two expressions: P = I^2R or P=V^2/R. The first expression indicates that the power is directly proportional to R, whereas the second expression indicates inverse proportionality .How can the seemingly different dependence of P on R in these expressions be explained?

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Answer 1

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》 P=I^2R is used when current flowing in every component of the circuit is constant. This is the case of series combination of the devices in the circuit.

》 P= V^2/R is used when potential difference (V) across every component of the circuit is constant. This expession is used in case of parallel combination in the circuit.

In series combination,R is greater than the value of R in parallel combination.

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Answer 2

ANSWER -

》 P=I^2R is used when current flowing in every component of the circuit is constant. This is the case of series combination of the devices in the circuit.

》 P= V^2/R is used when potential difference (V) across every component of the circuit is constant. This expession is used in case of parallel combination in the circuit.

In series combination,R is greater than the value of R in parallel combination.