Question

10. An electric refrigerator rated at 600 W operates 12 hours per day. What is
the cost of energy to operate it for 30 days at Rs. 9 per unit?

Answer 1

Answer:

Rs. 1944

Explanation:

solution is in image.

Answer 2

Question :

An electric refrigerator rated at 600 W operates 12 hours per day. What is

the cost of energy to operate it for 30 days at Rs. 9 per unit?

Answer :

$\bf\pink {Given :}$

• Power (P) = 600 W

• Time (t) = 12 hours

• Number of days = 30

• Rate is Rs 9 per unit .

$\bf\pink {To\:find :}$

• Energy?

• Electric bill at Rs 9 per unit ?

Explanation :

We know,

Energy = Power × Time

$\\ \longrightarrow\sf {600\times 30\times 12}$

$\\ \longrightarrow\sf {18000\times 12}$

$\\ \longrightarrow\sf {216000\:Wh}$

$\\ \longrightarrow\sf {216\:KWh}$

1 Kwh = 1 unit

216 Kwh = 216 unit

Electric bill at the rate of Rs 9 per unit = 216 × 9

$\\ \longrightarrow\sf {Rs \:1944}$