Question

An electric appliance is rated 2000 watt. Fnd the cost of using the appliance for 1.5 hours at Rs 5 per unit.​

Answer 1

Given :

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• $\sf Power = 2000 Watt = 2 Kilowatt$
• $\sf Time = 1.5 hrs$
• $\sf Rate\: per \: unit = Rs. 5$

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To find :

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• $\sf Total \: Cost = ??$

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Solution :

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$\bigstar\:{\underline{\sf We \:know \:that \::}}$

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$\star\;{\boxed{\sf{\pink{Work \: done = Power \times Time }}}}$

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$:\implies\sf Work \: done = 2Kw \times 1.5 hrs$

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$:\implies\sf Work \: done = 3kwh$

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$:\implies{\underline{\boxed{\frak{\purple{Work\: done = 3kwh }}}}}\;\bigstar$

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$\sf Cost\: of \: 1 \: kwh \: = \:Rs. 5$

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$\sf Cost\: of \: 3 \: kwh \: = \:Rs. 5 \times 3$

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$\sf Cost\: of \: 3 \: kwh \: = \:Rs. 15$

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$:\implies{\underline{\boxed{\frak{\purple { Total \: cost \: = Rs. 15}}}}}\;\bigstar$

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$\therefore\:{\underline{\sf{Cost\;of\; using \;the \:appliance\; for \; 1.5 hrs \; is \bf{Rs.\:15}.}}}$

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Answer 2

Answer:

Given that :-

Power = 2000 watt

Time = 1.5 hours

Cost of 1 unit = ₹5

To Find :-

Total cost

Solution :-

We know that

1 kW = 1000 w

2000 w = 2kW

Work done = Power × Time

=> Work done = 2 × 1.5

=> Work done = 3 kWh

Now,

Total cost = Work done × Cost of 1 unit

=> Total cost = 3 × 5

=> Total cost = ₹15