# Power and energy

This lesson introduces power and its relationship to energy. It provides lots of opportunities to practice calculations and conversions.

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!

Q1.Which energy store is in a toy on a high shelf?

1/10

Q2.Fill the gap: the plastic outer casing of a thermos vacuum flask reduces _____________

2/10

Q3.1000 J is equal to 1 kJ. What is 50 J in kJ ?

3/10

Q4.How do you get the safety flame on a Bunsen burner?

4/10

Q5.What does 'emit' mean?

5/10

Q6.Calculate the average (mean) of these numbers: 12, 14, 14, 16, 17, 20

6/10

Q7.Fill in the gap: Energy is ___________ between different stores by pathways.

7/10

Q8.As a liquid or gas cools, the cooled part becomes more ________ ?

8/10

Q9.Which of these is the correct equation for energy efficiency?

9/10

Q10.Complete the sentence: The control variable is the one we ____________

10/10

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!

Q1.Which energy store is in a toy on a high shelf?

1/10

Q2.Fill the gap: the plastic outer casing of a thermos vacuum flask reduces _____________

2/10

Q3.1000 J is equal to 1 kJ. What is 50 J in kJ ?

3/10

Q4.How do you get the safety flame on a Bunsen burner?

4/10

Q5.What does 'emit' mean?

5/10

Q6.Calculate the average (mean) of these numbers: 12, 14, 14, 16, 17, 20

6/10

Q7.Fill in the gap: Energy is ___________ between different stores by pathways.

7/10

Q8.As a liquid or gas cools, the cooled part becomes more ________ ?

8/10

Q9.Which of these is the correct equation for energy efficiency?

9/10

Q10.Complete the sentence: The control variable is the one we ____________

10/10

# 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.

Quiz:

# Energy and Power

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

Q1.Complete this definition: power is the _______ at which energy is transferred

1/10

Q2.What is the standard unit for power?

2/10

Q3.Power = _________ ÷ time

3/10

Q4.A fan is turned on a starts to spin fast - what is the useful energy store that increases?

4/10

Q5.Which fan would you expect to spin fastest?

5/10

Q6.Complete the gap: a light bulb with a higher power rating will transfer energy at a _________ rate than a light bulb with a lower power rating

6/10

Q7.1 kW = 1000 W. What is 6.5 kW in W?

7/10

Q8.Calculate the power for a bulb that transfers 100 J every 20 s

8/10

Q9.Calculate the power for a bulb that transfers 2 kJ every 10 s

9/10

Q10.Which of these is an example of an insulator?

10/10

Quiz:

# Energy and Power

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

Q1.Complete this definition: power is the _______ at which energy is transferred

1/10

Q2.What is the standard unit for power?

2/10

Q3.Power = _________ ÷ time

3/10

Q4.A fan is turned on a starts to spin fast - what is the useful energy store that increases?

4/10

Q5.Which fan would you expect to spin fastest?

5/10

Q6.Complete the gap: a light bulb with a higher power rating will transfer energy at a _________ rate than a light bulb with a lower power rating

6/10

Q7.1 kW = 1000 W. What is 6.5 kW in W?

7/10

Q8.Calculate the power for a bulb that transfers 100 J every 20 s

8/10

Q9.Calculate the power for a bulb that transfers 2 kJ every 10 s

9/10

Q10.Which of these is an example of an insulator?

10/10

# Lesson summary: Power and energy

## Time to move!

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

For 5 mins...

Move around:
Jog

On the spot:
Dance