Quiz 2.1 - Current as coulombs of charge passing a point each second

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This quiz has 8 questions. Click Submit at the end to mark it. No personal data is collected.

1. What does each black dot in our animation represent? *

1 point

An electron

An atom

One coulomb of electric charge

2. What is the unit of electrical charge? *

1 point

volt

coulomb

ampere

3. How many electrons do you need to have one coulomb of charge? *

1 point

6 million million

6 billion billion

6 trillion trillion

4. If we increase the current in a circuit, then the charges will move...(pick the best word to complete the sentence) *

1 point

faster

slower

backwards

Use the animation in question 5 to answer questions 5 - 7. It shows charges moving along wires of different thicknesses.

5. How many charges are there in each yellow box? *

1 point

Different boxes have different numbers of charges

6. How do you know that the current is the same in each wire? *

1 point

The charges all move at the same speed

Each wire contains the same number of moving charges

The same number of charges pass a point in the same time

7. For a given current, how does the thickness of the wire affect the speed of the charges? *

1 point

The thicker the wire, the slower the charges

The thicker the wire, the faster the charges

The thickness of the wire doesn't affect the speed of the charges

8. Look at this diagram, which shows charges moving through a metal wire where one part is thinner than the rest.

The current must stay the same. What are the relative speeds of the charges at points A, B and C?

1 point

Slow, Fast, Slow

Same speed at all three points

Fast, Slow, Fast

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