Question

For a heater rated at 4kwh and 220v calculate the cost if 1kwh is priced at rs 460

Answer 1

Answer:

Explanation:(I). The current is 18.18 A, (II). the resistance of the heater is 12.1 ohm, (III). the energy consumed will be 8 kW/hr and (IV). The cost of 8 kW/hr will be 4 rupees.

Explanation:

Given that,

Power = 4 kW

Voltage = 220 v

(I). The current is

We know that, the power is the product of current and voltage.

P = I\times V

I = \dfrac{P}{V}

I = \dfrac{4\ kW}{220\ V}

I = 18.18\ A

(II). The resistance of the heater is

Using ohm's law

V = I\times R

R = {V}x{I}

R = 220}x{18.18}

R = 12.1\Omega

(III). The energy consumed in 2 hours

E = Pt

E = 4\times2

E = 8\ kW/hr

(IV). If the cost of 1 kW/hr is 50 paise

Then, the cost of 8 kW/hr will be

The cost of 8 kW/hr

The cost of 8 kW/hr will be 4 rupees.