Question

A student's room has a TV (250 W) ,heater (1150 W) and lamp (200 W) Electricity costs 10 fills per KWh. Calculate how much it would cost to run these three appliances for a total of 2 hour 30 minutes

Answer 1

Cost = 40 fills

Step-by-step explanation:

First, we will calculate the total power consumed by all appliances:

`Power = P_(TV)+P_(heater)+P_(lamp)\\Power = 250\ W+1150\ W+200\ W\\Power = 1600\ W = 1.6\ KW`

Now, we will calculate the energy required:

`Energy = (Power)(Time)\\Energy = (1.6\ KW)(2.5 h)\\Energy = 4 KWh\\`

Now, for the cost we use the following formula:

`Cost = (Energy)(Unit\ Cost)\\Cost = (4\ KWh)(10\ fills/KWh)\\`

Cost = 40 fills