Question

For a heater rated 4kw and 220v calculate the energy consumed in 2 hours 45 minutes​

Answer 1

Answer:

energy consumption = power ×time

Answer 2

Answer:

Solution

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Given

P=4kW,V=220V

(a) I=?

Power=VI=250×I

4000=250×I

I=16amp

(b) R=?

P=I

2

R

P=16

2

×R

R=4000/16

2

R=15.25ohm

(c) Energy consumed in two hour =P×t

=4×2

=8kW−hr

(d) If 1kWh=Rs.4.6

total cost =8×4.6=Rs.36.8