1 Answers

Which of the following instruments consumes the highest current?

Posted by: 920 views ,
PHYSICS

 InstrumentsVoltage RatingPower Rating
AElectric iron250V1Kw
BTelevision set220V110W
CTorch light6V30W
DImmersion heater110V500W

Which of the following instruments consumes the highest current?

QUICK ANSWER…

C

DETAILS…  

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

KEY-POINTS…

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.

You are free to add your own answers below this page to assist others improve their learning.

You can also click the golden ASK A QUESTION BOTTON down this page to raise new related questions… OUR COMMUNITY OF EXPERTS WILL BE MORE THAN HAPPY TO TACKLE IT…

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

Answer Question