Question

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​

Answer 1

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 =

$\frac{ {v}^{2} }{p}$

=

$\frac{220 \times 220}{4000}$

= 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! ! !

Answer 2

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