Question

a 500 watt length give light for 10 hour on electric mains. find the cost of electric cunsuption for 30 days if cost of energy is 3 rupees unit​

Answer 1

Answer:

concept:

what is given let us write,

everyday we use = 10hr

total days = 30 days

cost = 3 rupee

power = 500 watt

wt we have to find,

cost of EC for 30 days.

Explanation:

so we have written wt is given as shown above

we convert total time that is

30days×10hr

300hr

formula :

U = K watt x Time

substitution,

500/1000 × 300

U = 150

so total consumption is

amount = 3rupee × 150

amount = 450 rupees

HENCE THE ANSWER IS 450 RUPEE.

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Answer 2

Answer:

The cost of electricity bill for 30 days is 450 rupees.

Explanation:

Given,

Power (P) = 500 W

On each day the light bulb glows for the time (t) = 10 Hr

Cost of energy per unit is 3 rupees per unit

The energy consumption for one day is (e) = (P)(t)

e = 500 W × 10 Hr/day

e = 5000 W-Hr = 5 kilowatt hour/day

Now the energy consumption for 30 days will be (E) = (e) (30)

E = 5 kilowatt hour/per × 30 days

E = 150 kilowatt hour

Therefore, E = 150 units (As 1 unit = 1 kilowatt hour)

If the cost of energy for one unit is 3 rupees, the the cost of 150 units will be:

3 rupees/unit × 150 units

hence, we get the cost of electricity bill for 30 days is 450 rupees.

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