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21/07/2021 8:39 pm
Topic starter
For a heater rated at 4 kW and 220 V, calculate :
(a) the current,
(b) the resistance of the heater,
(c) the energy consumed in 2 hours, and
(d) the cost if 1 kWh is priced at Rs 60.
1 Answer
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21/07/2021 8:47 pm
Given
P = 4 km, V = 220 v
(a) I = ?
Power = VI = 250 x I
4000 = 250 I
I = 16 amp
(b) R = ?
P = I2R
P = 162 x R
R = \(\frac{4000}{16^2}\)
R = 15.25 ohm
(c) Energy consumed in two hour = P x t
= 4 x 2
= 8kw-hr
(d) If 1 kwh = Rs 4.6
total cost = 8 x 4.6
= Rs 36.8