How much does it cost to use a 2.5kW electric fire for 4 hours if electricity costs $7.50 per unit?

$75

Explanation:

The unit of electricity is kilowatt-hour. Considering that 2.5 kW run for 4 hours, the consumption sums up to be 2.5*4=10 kWh. This is the units charged. Since it is given that 1kWh costs $7.5 then to get the the cost of 10kwh is given by cross multiplication ie

1kwh=7.5

10kwh=?

10kwh*$7.5/1kwh=$75

The total cost incurred for using the appliance for 4 hours is equivalent to $75

 $75

Explanation:

Given parameters:

Power = 2.5kW

Time  = 4hrs

Cost  = $7.50 per unit

Unknown:

Cost = ?

Solution:

This problem deals with household or industrial power consumption. It is a straight forward problem.

We have been given the rate;

           1kWh of electricity  = $7.50

Energy consumption  = Power x time

                                     = 2.5kW x 4hrs

                                      = 10kWh

        if;

                1kWh  is billed at $7.5

                 10kWh will yield  $75

he made 11 calls in one day

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles