Question

an electric oven rated at 500w is connected to a 220 v line and used for 2 hours daily . calculate the cost of electric energy per month at the rate of rupees 5 per kWh

Answer 1

To calculate the total cost we have to firstly calculate the total electricity amount consumer by the electric oven.

I= Power÷Voltage

=0.05÷2200 (500w=0.05Kw)

=1/440 A

Total consumed power:

Voltage×I×Time

=220×1/440×2

=1Kwh

Cost=1×60×5

=₹ 300(answer.)

Answer 2

Given that,

Power of electric oven, P = 500 W

Voltage, V = 220 V

Time, t = 2 hours

To find,

The cost of electric energy per month at the rate of rupees 5 per kWh.

Solution,

Electrical energy produced for 2 hours is given by :

P = 500 W = 0.5 kW

$E=P\times t\\\\E=0.5\ W\times 2\ h\\\\E=1\ kWh$

The energy consumed in a month is :

E = 1 kWh × 30

E = 30 kWh

The cost at the rate of Rs 5 per kWh is :

Cost = 30 kWh × 5 /kWh

Cost = Rs 150

So, the cost of electric energy per month at the rate of rupees 5 per kWh is Rs 150.