1 Answers
Which of the following instruments consumes the highest current?
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| Instruments | Voltage Rating | Power Rating | |
| A | Electric iron | 250V | 1Kw |
| B | Television set | 220V | 110W |
| C | Torch light | 6V | 30W |
| D | Immersion heater | 110V | 500W |
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:
- A is not the right answer. current here = 1kW/250 = 1000/250 = 4A
- B is incorrect. current here = 110/220 = 0.5A
- C is correct. current here = 30/6 = 5A, this is the highest value.
- 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.
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/ culled from 2020 JAMB-UTME physics past question 37 /
