Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate:
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate:
(i) the total current taken from the supply
(ii) the resistance of each heater and
(iii) the energy supplied in kWh to the three heaters in 5 hours.
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1 Answers
Given,
Power, p = 250 w
Voltage, v = 100 v
(i) current through each heater, I = ?
As p = VI
⇒ I = P/V
= 250/100 = 2.5 A
∴ Current taken for the three heaters = 3 × 2.5 = 7.5 A
(ii) resistance for each heater, R = V/I
= 100/2.5 = 40Ω
(iii) Time for which energy is supplied, t = 5h
As, Energy, E = p × t
E = 250 × 5 = 1250 wh
Or
E = 1.25 kwh
Energy for three heaters = 3 × 1.25 = 3. 75 kwh
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