Question

I can spend Rs 9.00 per month (30days) on electric light . if power is 30 paise per KWh and i use 5 identical bulbs for 5 hours a day, what should be the power of each bulb ?

Answer 1

Answers :-

Given ,

Total cost = Rs 9.00

cost of each unit (1KWh) = 30 paise = 0.30 rupees

Number of bulbs = 5

Time for which bulb run daily = 5 hr

Number of Days = 30
power = ?

To calculate :

Let the power of each bulb = p

Total power = 5* p

Number of units which I can use = Total cost / Rate

9.00/0.30= 30

I can assume 30 units of energy

No of hours = 30 * 5 = 150 hr

power = no of kilowatt hrs/ no of hours

= 30 *1000/ 150 watts

= 200 watts

Therefore,

power of each bulb = 200/5

p = 40 watt

I can use 5 bulbs of 40 watts each .

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Answer 2

Answers :-

Given ,

Total cost = Rs 9.00

cost of each unit (1KWh) = 30 paise = 0.30 rupees

Number of bulbs = 5

Time for which bulb run daily = 5 hr

Number of Days = 30

power = ?

To calculate :

Let the power of each bulb = p

Total power = 5* p

Number of units which I can use = Total cost / Rate

9.00/0.30= 30

I can assume 30 units of energy

No of hours = 30 * 5 = 150 hr

power = no of kilowatt hrs/ no of hours

= 30 *1000/ 150 watts

= 200 watts

Therefore,

power of each bulb = 200/5

p = 40 watt

I can use 5 bulbs of 40 watts each