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Homework Help: Voltage Ambiguity?

  1. May 2, 2006 #1
    A question from my HW on Alternating Currents: "When a domestic electric heater is operated from a 240 V a.c. supply, an r.m.s. current of 8.0 A flows. Assuming the heater is purely resistive, calculate its resistance, mean power and maximum instantaneous power. "

    I don't know what is meant by "240 V a.c. supply". Is the question referring to the peak voltage or the r.m.s. voltage? Or is there another convention that is generally agreed to? :confused: This is all that is holding me back from answering the question. :mad:
  2. jcsd
  3. May 2, 2006 #2


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    Homework Helper

    240 V is the rms voltage. It's the accepted convention for giving a.c. supply voltages.
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