Question

An electrical company charges 15 p per unit of energy (kWh).

Calculate the cost of running a 500 W freezer for a day. Show your working.

Answer 1

180 p

Step-by-step explanation:

Energy refers to the capacity of doing work.

Amount charged by an electrical company = 15 p per unit of energy (kWh)

As 1 W = 1000 kW,

`500W=(500)/(1000)kW=0.5\,kW`

Also, 1 day = 24 hours.

Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour =
`15* 0.5=7.5\,p`

Therefore,

cost of running a 0.5 kW freezer for a day ( 24 hours ) =
`7.5* 24=180\,p`

Amount charged by an electrical company = 15 p per unit of energy (kWh)

As 1 W = 1000 kW,

`500W=(500)/(1000)kW=0.5\,kW`

Also, 1 day = 24 hours.

Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour =
`15* 0.5=7.5\,p`

Therefore,

cost of running a 0.5 kW freezer for a day ( 24 hours ) =
`7.5* 24=180\,p`