Question

9. An electric heater of rating 1000 W 1 point
is used for 5 hrs per day for 20 days.
The electrical energy utilised is *
O (a) 150 kWh
O (b) 200 kWh
O (c) 100 kWh
O (d) 300 kWh​

Answer 1

Answer:

option : (C)

Explanation:

Given :-

Power of electric heater = 1000W

1000 W = 1 kW

so, power of electrical heater is 1 kW

Time period = 5 × 20 = 100 hrs

Electrical energy utilised = power × time

Electrical energy utilised = 1 × 100

= 100 kWH

Answer 2

Given - Rating of electric heater = 1000 Watt

Time used per day = 5 hours

Number of days = 20

Find - Electrical energy utilised in consumption for given period.

Solution - Electrical energy consumed can be calculated by the formula = Power*time.

Total time period = 20*5 = 100 hours.

Keeping the values in formula-

Electrical energy = 1000*100

Electrical energy = 10⁵ Wh

Converting it in kWh, electrical energy will be 10² kWh or 100 kWh.

Hence, electrical energy utilizes is (c) 100 kWh.