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Question

An electric device consumes 8640J of energy in 30 min, while operating at 24V. Calculate the current drawn by the device.


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Solution

Step 1: Given data,

  1. Energy W=8640J
  2. Voltage =24V
  3. Time t=30min

Step 2: Find the current drawn by the device,

Energy consumed in terms of the power and time is,

W=Pt……(1)

The power in terms of voltage and current is,

P=VI……..(2)

Thus, from equations (1) and (2),

W=VIt

Substituting the known values,

8640=24×I×30×60

From the equation, the value of the current is,

I=864024×30×60=864043200=0.2A

Thus, the current drawn by the device is 0.2A.


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