Question

An electric bulb draws a current of 8A and works on 250V on the average 8 hours a day

Answer 1

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An electric bulb draws a current of 0.8 A from 250 V mains. The bulb is used on an average 8 hours a day, If the energy costs Rs 3 per kwh ,calculate the monthly bill for 30 days.

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The monthly bill for 30 days will be 144 rupees.

Explanation:

Suppose that...

Charge = V

Current = I

Here is given...

V = 250 V

I = 0.8 A

Let calculate from the formula...

P = V × I

= 250 × 0.8 = 200 W = 200/1000 kw

E = P × t

= 200/100 × (8 × 30)

= 0.2 × 240 = 48 kwh

∵ costs is 3 per kwh so...

= 48 × 3 = 144

So the monthly bill for 30 days will be 144 rupees.

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