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Which of the following instruments consumes the highest current?

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 InstrumentsVoltage RatingPower Rating
AElectric iron250V1Kw
BTelevision set220V110W
CTorch light6V30W
DImmersion heater110V500W

Which of the following instruments consumes the highest current?




To resolve this, you will have to use the respective values of power and voltage to calculate the current for each case.

Please note that power = current × voltage,

Therefore, current = power/voltage

Now for the right answer to the above question:

  1. A is not the right answer. current here = 1kW/250 = 1000/250 = 4A
  2. B is incorrect. current here = 110/220 = 0.5A
  3. C is correct. current here = 30/6 = 5A, this is the highest value.
  4. D is incorrect. not vaporization point. current here = 500/110 = 4.545A


You may please note this/these:

  • Remember to convert the power from kW to watt in option A.
  • Even though option C has the lowest power rating, it consumes the highest current due to its voltage.

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/ culled from 2020 JAMB-UTME physics past question 37 /

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