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 transformer.
A transcriber.
A transducer.
A transmitter.

Question 2. What would a DC supply look like on an oscilloscope?

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

Question 3. What is the mains potential difference and frequency in the U.K?

110V, 60Hz.
230V, 60Hz.
230V, 50Hz.
110V, 50Hz.

Question 4. Which analogy is similar to an AC supply?

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

Question 5. Why do we use AC for mains electricity?

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

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