Question

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.

Answer 1

Answer:

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.

Answer 2

Answer:

I=0.8A

PD=250 V

T=8hr/day

R=V/I=250×10/8

P=V×V/R

=250×250×8/250×10

=200W

E=PT

200×8

=1600WH

=1.6KWH

FOR 30 DAYS=30×16/160

=4.8 UNITS

1 UNIT =3 RS

48 UNITS =48×3

=144

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