topic badge

5.01 Energy of human consumption

Interactive practice questions

Use the fact that $1$1 kWh = $3.6\times10^6$3.6×106 J to calculate how many joules $4$4 kWh is equal to.

Express your answer as a basic numeral.

Easy
1min

Use the fact that $1$1 kWh = $3.6\times10^6$3.6×106 J to calculate how many joules $104.23$104.23 kWh is equal to.

Easy
1min

Energy consumption can be measured in joules (J). If we want to determine how much energy an appliance consumes in a day, all we need is the power the appliance uses in watts (W) and how long the appliance is used for (in seconds). The formula for calculating this is:

$\text{Energy Consumed}$Energy Consumed$=$=$\text{Power }$Power $\times$×$\text{Time }$Time

Easy
2min

An appliance consumes energy at a rate of $1200$1200 watts. How many joules of energy does it use if it runs for $29$29 seconds?

Easy
1min
Sign up to access Practice Questions
Get full access to our content with a Mathspace account

Outcomes

1.3.15

use units of energy to describe consumption of electricity, such as kilowatt hours

What is Mathspace

About Mathspace