Comment the reason for this.?

Question

In a d.c circuit, if the current and resistance are known, power (power = (current)(current)(resistance)) can be determined. This relationship also applies to an a.c circuit. Comment the reason for this.

Answer 1

this does not apply to ac always.
in ac the power is cal culated as P = I x I x R x powerfactor
power factor being cosine of the angular lead of the current from the voltage

Answer 2

In a simple AC circuit, current (rate of electron flow) cycles from zero to max (positive direction) to zero to max (negative direction) and back to zero 60 Hz (cycles per second). The meter used to measure current gives average current (RMS or root mean squared) that makes both halves of the cycle positive and constant (like DC).

Answer 3

Actually the relationship applies to AC circuits only insofar as instantaneous values are concerned. I² x R will give you apparent power. If you multiply further by cosθ then you will get true (AC) power.

Answer 4

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