# Efficiency

This lesson summarises many of the foundational concepts about energy that have been introduced in lessons 1, 2 and 3 by investigating pendulums. It then discusses useful and wasted energy transfers and calculates efficiency from written questions and Sankey diagrams.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

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## Q10.What is 33 J in kJ?

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

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# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

# Efficiency

This quiz will have questions from the lesson called 'Efficiency' and previous lessons in the Energy topic. Please complete this quiz to consolidate your learning.

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## Q10.Calculate the average (mean) of these numbers: 12, 15, 9, 21, 18

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

# Efficiency

This quiz will have questions from the lesson called 'Efficiency' and previous lessons in the Energy topic. Please complete this quiz to consolidate your learning.

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# Lesson summary: Efficiency

### It looks like you have not completed one of the quizzes.

To share your results with your teacher please complete one of the quizzes.

### Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga

### Take part in The Big Ask.

The Children's Commissioner for England wants to know what matters to young people.

Share your views and have your voice heard.

The next lesson in Energy is "Conduction"