Question

A geyser of 200 w is used for 1 hour daily. Calculate the monthly consumption ( 30 days) of electrical energy units. Also calculate the cost of electricity units consumed in a month if rate per unit is 3.50

Answer 1

Answer : Rs 21

Step-by-step explanation :

Since we know that,

1 W = 1/1000 kW

200 W = 200/1000 kW

200 W = 0.2 kW

This much power is used for 1 hr

= 0.2 kW × 1 h

= 0.2 kWh

Thus, in 1 day 0.2 kWh energy has been consumed.

Now this energy is consumed in 30 days

= 0.2 kWh × 30

= 6 kWh

Here, cost rate per unit is Rs 3.5

So, cost of 6 kW = 6 × Rs 3.5

Cost of 6 kW used in a month= Rs 21

Answer 2

Power= 200W

Time= 1 hour

Energy = Power× Time

=200W ×1h

=200Wh

=0.2KWh or 0.2 unit

Total cost= 0.2unit × 3.50

= 0.7 rupees

Total cost of 30 days = 0.7× 30

=21 rupees