Question

. An electric heater of 1000 W is used for 3 hr a day. What is the cost of using it for a month of 25 days, if 1 unit costs rupee 4?

Answer 1

Answer:

Daily consumption , So , monthly consumption , Therefore , cost per month is : So , the cost of using it for a month of 25 days is 300 Rs .

Explanation:

Given :    P=1000 W =1 kW              t=10 h

∴ Energy consumed in 10 h       E=Pt=1×10=10 kWh

Answer 2

Explanation:

We have,,

Power of electric heater, P = 1000 W = 1 kW

Time till which the heater is used,t = 3 h/day

Therefore,

Heat energy consumed in a day is given by,

$\sf{H=Pt}$

$\sf{\implies{H=1\times{3}\:kWh/day}}$

$\sf{\implies{H=3\:u/day}}$

Since,cost of 1u is 4 rs. therefore bill of one day

= 3 × 4 = 12 rs

And thus, bill of 25 days = 12 × 25 = 300 rs.✓✓✓

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Hope it helps ❣️❣️❣️