Electrical power (Part 2)

In this lesson we will be linking power to energy transferred electrically and reviewing the energy transfers that take place in electrical appliances.

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!

Question 1

Question 2

Question 3

Question 4

Question 5

Q1.Revision: What colour is the neutral wire in a 3 pin plug?

1/5

Q2.What is the unit of power?

2/5

Q3.Which equation correctly describes the relationship between power, current and potential difference?

3/5

Q4.Calculate the current that flows through a 60 W lamp if the potential difference across it is 8 V

4/5

Q5.Calculate the power of a speaker if it has a current of 250mA and a resistance of 4 Ohms.

5/5

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!

Question 1

Question 2

Question 3

Question 4

Question 5

Q1.Revision: What colour is the neutral wire in a 3 pin plug?

1/5

Q2.What is the unit of power?

2/5

Q3.Which equation correctly describes the relationship between power, current and potential difference?

3/5

Q4.Calculate the current that flows through a 60 W lamp if the potential difference across it is 8 V

4/5

Q5.Calculate the power of a speaker if it has a current of 250mA and a resistance of 4 Ohms.

5/5

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:

Power part 2

This quiz will test your knowledge from this lesson and your prior learning.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Q1.Revision: Which wire is the fuse connected in series with in a 3 pin plug?

1/6

Q2.Revision: Select the two sources that supply a direct current to a circuit.

Select two (2) boxes

2/6

Q3.Which of these is the definition of power?

3/6

Q4.Which of these equations is correct?

4/6

Q5.An electric toothbrush has a power rating of 15 W. If it is used for 2 minutes. How much energy is transferred?

5/6

Q6.How much charge flows through a lamp, if 20 J of energy is transferred and it has a p.d. of 5 V across it?

6/6

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:

Power part 2

This quiz will test your knowledge from this lesson and your prior learning.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Q1.Revision: Which wire is the fuse connected in series with in a 3 pin plug?

1/6

Q2.Revision: Select the two sources that supply a direct current to a circuit.

Select two (2) boxes

2/6

Q3.Which of these is the definition of power?

3/6

Q4.Which of these equations is correct?

4/6

Q5.An electric toothbrush has a power rating of 15 W. If it is used for 2 minutes. How much energy is transferred?

5/6

Q6.How much charge flows through a lamp, if 20 J of energy is transferred and it has a p.d. of 5 V across it?

6/6

Lesson summary: Electrical power (Part 2)

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