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Q. 95.0( 4 Votes )

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 ₹ 4.60

Class 10th Lakhmir Singh & Manjit Kaur - Physics 1. Electricity

Answer :

(a) Here, P = 4kw, V = 220v

I = ?

We know that

Power = VI = 220 × I

4000 = 220I

I = 4000/220= 18.18A

(b) Here, P = 4kw, V = 220v

R = ?

We know that,

P = I²R

P = (18.18)²×R

R = 4000/(18.18)²

R = 12.10 Ω

(c) Here, P = 4kw, time = 2hr

Energy consumed in two hour = P × t

= 4 × 2

= 8kw-hr

(d) If 1kwh = Rs 4.6

Here, Energy consumed in two hour = 8kwh

So, total cost = 8 x 4.6 = Rs 36.8

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PREVIOUSA bulb is rated as 250 V; 0.4 A Find its:(i) power, and (ii) resistance.NEXTAn electric motor take 5 amperes current from a 220 volts supply line. Calculate the power of the motor and electrical energy consumed by it in 2 hours.

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