Question

An electric bulb marked with 100V-60W is used for 5 hours in a week. What is the cost of electricity if the rate is 3 Rupees per unit? ​

Answer 1

Answer:

ANSWER

Given : t=6 hrs

P=0.06 kW

Thus energy consumed per day is:

E=Pt=0.06×6=0.36 kWh=0.36 units

Answer 2

Solution :-

$\: \:$

$\: \: \: \: \: \:$ Given that ,

$\: \:$

→ Power $\longrightarrow$ 60W

→ Time taken $\longrightarrow$ 5 hours

So,

$\\ {} \: \: \: \: \: \: \color{violet}\underline{\boxed{ \sf Power\: consumed \: in \: one \: day = power × time \: taken} }$

$\: \: \\ \sf \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: : \: \implies \: 60 \: \times \: 5 \\ \\ \: \: \: \: \: \: \: \: \: \:: \: \sf \implies \underline{ \boxed{\frak{ \pink{ 300 \: WH}}}}$

Now , The number of days = 7 days

$\\ {} \: \: \: \: \: \: \therefore \: \: \: \: \: \color{violet}\underline{\boxed{ \sf \:Total \: power \: = power\: one \: day \: \times 7} }$

$\: \: \\ \sf \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: : \: \implies \: 300 \: \times \: 7\\ \\ \: \: \: \: \: \: \: \: \: \:: \: \sf \implies \underline{ \boxed{\frak{ \pink{ 2100\: WH = 2.1 \: W}}}}$

We know that ,

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \star \: \: \sf \: 1 \: KW = 1 \: unit$

So,

$\\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \rightarrow \: \: \: \sf \: 2.1 \: KW = 2.1 \: unit$

Now , we have to find the cost of electricity ,

$\\ \: \: \: \: \: \: \: \: \: \: \: \: \sf Cost = 2.1 \times 3 \\ \\ \: \:\:\:\:\: \:\:\:\:\: \sf\:\:\:\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:\:\:\: = 6.3$

Rs 6.3 the cost of electricity if the rate is 3 Rupees per unit?