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Physics

Electric Power

A house is fi...

Question

A house is fitted with ten lamps of each $60 W$ . Each lamp burns for $5 h r s$ a day on an average. The cost of consumption in a month of $30 d a y s$ at $2. 80$ rupees per unit is:

R s . 152

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R s . 252

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R s . 352

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R s . 452

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Solution

The correct option is B $R s . 252$
Total energy spent is given by: $E = n E^{'}$
where $n :$ number of bulbs
$E^{'} :$ Energy spent by each bulb
$E^{'} = P t$
$E^{'} = 60 \times 5 \times 30 W h$

$E = 60 \times 5 \times 30 \times 10$
$= 9000 \times 10$
$= 90 K W h$
Cost $= 90 \times 2.8$
$= 28 \times 9$
$= 252 R s$

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A house is fitted with ten lamps of each 60 W. Each lamp burns for 5 hrs a day on an average. The cost of consumption in a month of 30 days at 2.80 rupees per unit is:

The correct option is B Rs.252Total energy spent is given by: E=nE′ where n: number of bulbs E′: Energy spent by each bulbE′=PtE′=60×5×30 WhE=60×5×30×10 =9000×10 =90KWhCost =90×2.8 =28×9 =252Rs

A house is fitted with ten lamps of each $60 W$ . Each lamp burns for $5 h r s$ a day on an average. The cost of consumption in a month of $30 d a y s$ at $2. 80$ rupees per unit is: