ICSE Class 10 Physics 2018 Solved Paper

An electric iron is rated $220 {\V}, 2 k W$ .

Question : 61 of 78

Marks: +1, -0

If the iron is used for

2 {\h}

daily find the cost of running it for one week if it costs

\₹ 4.25 {\per} {\kWh}

Solution:

Given:

\;\; {\P}=2 {\kW}

Time

(t)=2 h

(daily)
Energy consumed in 1 day

\;=\;\text " Power "\; × \;\text " time "\;

\;=2 {\kW} × 2 h

\;=4 {\kW} h

∴

Energy consumed in 1 week

\;=4 {\kWh} × 7

\;=28 {\kW} h .

∴

Cost of running it for 1 week

\;=\₹ 4.25 × 28

\;=\₹ 119

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