Question

A lightbulb has a power of 60 W and is used for 16 hours. A toaster oven has a power of 1500 W

and is used for 45 minutes. (Use correct units in all answers)
a How much energy is used by the lightbulb? (2 points)

Answer 1

a. The lightbulb uses the energy of 960 W or 9.60 kW.

Explanation:

Step 1:

To determine the energy used by the appliances we need to understand the equation

`power = (energy)/(time) .`

To determine the energy used, we multiply the power of the appliance with the amount of time it has been used for.

Step 2:

The lightbulb has a power of 60 W and is used for a period of 16 hours.

The energy used by the lightbulb
`= 60(16) = 960` W = 0.96 kW.

The toaster oven has a power of 1,500 W and is used for 0.75 hours.

The energy used by the toaster oven
`= 1,500(0.75) = 1,125` W = 1.125 kW.