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$16$ bulbs of $40 W$ are used for $6$ hours a day along with one $100 W$ bulb for $2$ hours. Calculate the units of energy consumed by all the bulbs in $1$ day.

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4.04

units

2.02

units

6.5

units

1.6

units

answer is A.

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Detailed Solution

16

bulbs of

40 W

are used for

6

hours a day along with one

100 W

bulb for

2

hours. The energy consumed by all the bulbs in 1 day is

4.04 units .

Given:
Power of

16

bulbs of

40 W

each,

P = 16 \times 40 W

\Rightarrow

= 640 W

Time taken by

16

bulbs,

t = 6

Energy consumed by

40 W

bulbs,

E = P \times t

\Rightarrow = 640 \times 6

\Rightarrow = 3840 Wh

Energy consumed by

P = 100 W

bulb for

t = 2 hours

E = P \times t

\Rightarrow = 100 \times 2

\Rightarrow = 200 Wh

Total energy consumed in a day by all bulbs

= (3840 + 200) Wh

\Rightarrow = 4040 Wh

\Rightarrow = 4.04 kWh

\Rightarrow = 4.04 units

[as

1 unit = 1 kWh]

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16 bulbs of 40 W are used for 6 hours a day along with one 100 W bulb for 2 hours. Calculate the units of energy consumed by all the bulbs in 1 day.

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$16$ bulbs of $40 W$ are used for $6$ hours a day along with one $100 W$ bulb for $2$ hours. Calculate the units of energy consumed by all the bulbs in $1$ day.