Snapquiz - AC vs DC

This is the Snapquiz on AC vs DC. Click here or use the embedded video if you haven't watched the lesson yet.

Question 1. Which type of device is used to step up or step down an AC supply?

A transducer.
A transmitter.
A transcriber.
A transformer.

Question 2. Which analogy is similar to an AC supply?

The waves on the sea moving up and down at random.
The tide regularly coming in and going back out again.
The wind blowing in different directions every day.
A river flowing in the same direction all the time.

Question 3. Why do we use AC for mains electricity?

AC electricity flows back and forth from the supply.
It's less dangerous than DC.
It's easy to generate and can be distributed efficiently.
It's the agreed international standard way to generate electricity.

Question 4. What is DC short for?

Dilute Current.
Dangerous Current.
Direct Current.
Device Current.

Question 5. What would a DC supply look like on an oscilloscope?

A wave going from positive to negative over time.
A straight line remaining at a potential difference of zero over time.
A straight line remaining at a single non-zero potential difference over time.
A curved line starting at a high positive potential difference then steadily falling to zero.


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