# Light dependent resistors

In this lesson we will be learning about LDRs and how their resistance is affected by light intensity. We will also look at an experiment that includes LDRs.

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!

Q1.Two identical resistors (10 Ω) are connected in series. What will be their total resistance?

1/6

Q2.A cell in a parallel circuit has a potential difference of 12 V. What will be the potential difference across each branch?

2/6

Q3.What does this electrical symbol represent?

3/6

Q4.What does LED stand for?

4/6

Q5.In which direction is conventional current said to flow?

5/6

Q6.What is the threshold voltage?

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:

# 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.Two identical resistors (10 Ω) are connected in series. What will be their total resistance?

1/6

Q2.A cell in a parallel circuit has a potential difference of 12 V. What will be the potential difference across each branch?

2/6

Q3.What does this electrical symbol represent?

3/6

Q4.What does LED stand for?

4/6

Q5.In which direction is conventional current said to flow?

5/6

Q6.What is the threshold voltage?

6/6

# 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"
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# 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:

# Light Dependent Resistors

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

Q1.What is this an electrical symbol for?

1/6

Q2.In a filament bulb, as the temperature increases what happens to the resistance of the filament?

2/6

Q3.The abbreviation LDR means?

3/6

Q4.In an experiment to investigate how light intensity affects the resistance of an LDR. What is the dependent variable?

4/6

Q5.When the light intensity increases, what happens to the resistance of the LDR?

5/6

Q6.As light intensity decreases, what happens to the current through the LDR?

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:

# Light Dependent Resistors

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

Q1.What is this an electrical symbol for?

1/6

Q2.In a filament bulb, as the temperature increases what happens to the resistance of the filament?

2/6

Q3.The abbreviation LDR means?

3/6

Q4.In an experiment to investigate how light intensity affects the resistance of an LDR. What is the dependent variable?

4/6

Q5.When the light intensity increases, what happens to the resistance of the LDR?

5/6

Q6.As light intensity decreases, what happens to the current through the LDR?

6/6

# Lesson summary: Light dependent resistors

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## Time to move!

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