Science

Exit Lesson

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.

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

Question 6

Question 7

Question 8

Question 9

Question 10

Q1.Which part of the Bunsen burner do you twist to open or close the air hole?

1/10

Q2.Which of these is the name we give to the hotter flame on a Bunsen burner?

2/10

Q3.Which is the variable that we change?

3/10

Q4.Which is the variable that we observe?

4/10

Q5.Which is the variable that we keep the same?

5/10

Q6.Calculate the average (mean) of these numbers: 6, 5, 7, 9, 8

6/10

Q7.What type of word should every step of a method start with?

7/10

Q8.Which energy store is full when you stand on top of a hill?

8/10

Q9.Which energy store is fills up as you run down a hill?

9/10

Q10.What is 33 J in kJ?

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!

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Q1.Which part of the Bunsen burner do you twist to open or close the air hole?

1/10

Q2.Which of these is the name we give to the hotter flame on a Bunsen burner?

2/10

Q3.Which is the variable that we change?

3/10

Q4.Which is the variable that we observe?

4/10

Q5.Which is the variable that we keep the same?

5/10

Q6.Calculate the average (mean) of these numbers: 6, 5, 7, 9, 8

6/10

Q7.What type of word should every step of a method start with?

7/10

Q8.Which energy store is full when you stand on top of a hill?

8/10

Q9.Which energy store is fills up as you run down a hill?

9/10

Q10.What is 33 J in kJ?

10/10

Video

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Worksheet

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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.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Q1.If the total supplied energy to the fan is 250 J and 200 J is usefully transferred to the kinetic store, how much is wasted by heating?

1/10

Q2.If the total supplied energy to the fan is 250 J and 200 J is usefully transferred to the kinetic store, how efficient is the fan?

2/10

Q3.Which energy pathway is used to transfer energy from a battery to the motor in the fan (which makes the blades spin round)?

3/10

Q4.Which is the main useful energy store that fills, when an oven is turned on?

4/10

Q5.This Sankey diagram is for an oven. Assuming each little box is 1 J, how much energy is transferred usefully?

5/10

Q6.This Sankey diagram is for an oven. Assuming each little box is 1 J, what is the efficiency of the microwave?

6/10

Q7.When an oven is turned on, most of the total energy supplied is usefully transferred to the food to cook it, but where does the wasted energy go?

7/10

Q8.Which of these is the name we give to the cooler flame on a Bunsen burner?

8/10

Q9.What is 20 kJ in J?

9/10

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

10/10

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.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Q1.If the total supplied energy to the fan is 250 J and 200 J is usefully transferred to the kinetic store, how much is wasted by heating?

1/10

Q2.If the total supplied energy to the fan is 250 J and 200 J is usefully transferred to the kinetic store, how efficient is the fan?

2/10

Q3.Which energy pathway is used to transfer energy from a battery to the motor in the fan (which makes the blades spin round)?

3/10

Q4.Which is the main useful energy store that fills, when an oven is turned on?

4/10

Q5.This Sankey diagram is for an oven. Assuming each little box is 1 J, how much energy is transferred usefully?

5/10

Q6.This Sankey diagram is for an oven. Assuming each little box is 1 J, what is the efficiency of the microwave?

6/10

Q7.When an oven is turned on, most of the total energy supplied is usefully transferred to the food to cook it, but where does the wasted energy go?

7/10

Q8.Which of these is the name we give to the cooler flame on a Bunsen burner?

8/10

Q9.What is 20 kJ in J?

9/10

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

10/10

Lesson summary: Efficiency

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The next lesson in Energy is "Conduction"

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