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AC and RMS voltage

Compare mean heating under AC and DC to find the RMS voltage.

    E12 · AC and RMS voltage0.00 s · Ready

    Electronics · AC and power / Principles and inquiry

    AC and RMS voltage experiment guide

    Compare mean heating under AC and DC to find the RMS voltage.

    How does it work?

    For a sine wave RMS is peak/√2, and mean power is Vrms²/R.

    Key relationship

    Vrms = V₀/√2 · Pavg = V₀²/(2R)

    Try this investigation

    1. Compare mean heating under AC and DC to find the RMS voltage.
    2. Run and record each of the three baseline presets.
    3. Compare the changed variable and its result with the baseline records.

    Interpreting your results

    What is the mean power of a 6 V peak sine wave across 20 Ω?

    0.9 W

    Assumptions and limitations

    The load is an ideal resistor, so current and voltage have no phase difference. Experiment on screen; do not reproduce this with real power supplies, outlets or high voltage.