Question
Answer the following questions:
In any ac circuit, is the applied instantaneous voltage equal to the algebraic sum of the instantaneous voltages across the series elements of the circuit? Is the same true for rms voltage?
Solution
Yes. At any instant the voltage variations across each element will follow the variations of the supply voltage. Hence, the applied instantaneous voltage is equal to the algebraic sum of the instantaneous voltages across the series elements. But, this is not true for rms voltage because voltage across different elements may not be in phase with each other.
