In the diagram above, a bulb is lit by drawing 2.0A…

Physics WAEC 2021

 

 

 

In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt -hour . - SchoolNGR

 

In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt-hour .                 

 

  • $16.90 checkmark
  • $84.48
  • $1690.00
  • $8.48

The correct answer is: A

Explanation

Power[p] = IV → 2 * 440 = 880Watt

Energy = p * t = 880 * 48hrs

= 42240 or 42.24kwh

But 1 kwh cost $0.40
∴ 42.24kwh costs 42.24 x 0.40

= 16.896 or $16.90

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