A 2500 watts refrigerator works for 4 hours per day. Find the total unit of electricity used in 40 days.

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SSC JE Electrical 9 Oct 2023 Shift 3 Official Paper-I
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  1. 400000 units
  2. 40 units
  3. 400 units
  4. 10 units 

Answer (Detailed Solution Below)

Option 3 : 400 units
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Detailed Solution

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Concept

The energy consumed by electrical appliances is given by:

E = P × t

where, E = Energy

P = Power 

t = Time

Calculation

Given, P = 2500 W

t = 4 hrs/day

E = 2500 × 4

E = 100,00 = 10 kW/hr = 10 units

For 40 days, E = 10 × 40 = 400 units

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