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A hot plate of an electric oven connected to 220 volt coil has 2 resistance coil A and B. Each of 24Ω resistance which may be used separately and parallel. What are the currents in 3 cases?

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asked by bh
  1. Voltage (volts) = current (amp) * resistance (Ω)
    or
    I=V/R (amps)

    V=220 volts
    Case 1: each resistance alone, R=24Ω
    Case 2: in series, R=2*24=48Ω
    Case 3: in parallel, R=1/(1/24+1/24)=12Ω

    You can then calculate current I in each case using formula above.

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