Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be

Unless otherwise specified, any values given for current or voltage in an ac circuit are assumed to be

• A. effective values.
• B. instantaneous values.
• C. maximum values.
• D. peak values.

Answer: (A)

In AC circuits, the values you’re given for voltage or current are assumed to be the effective, or RMS, values. This is because RMS values are the ones that relate directly to heating effects and real power. They represent the DC equivalent that would produce the same average power in the circuit over time. So, unless the problem says otherwise, the numbers you see are RMS values. Instantaneous values are the real-time values that vary over the cycle, and peak (maximum) values are just the top amplitude of the waveform; neither is used for normal circuit ratings and power calculations. For a sinusoidal wave, the RMS value is the peak value divided by sqrt(2), which is why RMS is so convenient for analyzing AC power.

In AC circuits, the values you’re given for voltage or current are assumed to be the effective, or RMS, values. This is because RMS values are the ones that relate directly to heating effects and real power. They represent the DC equivalent that would produce the same average power in the circuit over time. So, unless the problem says otherwise, the numbers you see are RMS values. Instantaneous values are the real-time values that vary over the cycle, and peak (maximum) values are just the top amplitude of the waveform; neither is used for normal circuit ratings and power calculations. For a sinusoidal wave, the RMS value is the peak value divided by sqrt(2), which is why RMS is so convenient for analyzing AC power.