QUESTION FOR CLASS 10
ANSWER IT ONLY IF U KNOW THE ANSWERS ..... NO SPAMMING
for a heater rated at 4 kw and 220 v calculate a) current b)resistance c) enerjy consumed in 2 hrs and cost if 1kW is rs 4.60
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QUESTION FOR CLASS 10
ANSWER IT ONLY IF U KNOW THE ANSWERS ..... NO SPAMMING
for a heater rated at 4 kw and 220 v calculate a) current b)resistance c) enerjy consumed in 2 hrs and cost if 1kW is rs 4.60
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Answer:
For a heater Power P = 4Kw = 4000w
Voltage of the supply , V = 220v
a) Current drawn by the heater , I= P/V
4000/220 = 18.1 A
b) Resistance of the heater ,R =
=
= 12.1 ohm
c) Energy consumed in 2 hrs = P×t = 4 Kw× 2 hrs = 8 Kwh
d) Cost of energy if 1Kwh is priced at Rs. 4.60 = 8 × 4.60 = Rs. 36.8
Hope it helps! ! !
Explanation:
For a heater Power P = 4Kw = 4000w
Voltage of the supply , V = 220v
a) Current drawn by the heater , I= P/V
4000/220 = 18.1 A
b) Resistance of the heater ,R =
\frac{ {v}^{2} }{p}
p
v
2
=
\frac{220 \times 220}{4000}
4000
220×220
= 12.1 ohm
c) Energy consumed in 2 hrs = P×t = 4 Kw× 2 hrs = 8 Kwh
d) Cost of energy if 1Kwh is priced at Rs. 4.60 = 8 × 4.60 = Rs. 36.8