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. Why do we use AC for mains electricity?

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


Question 2. Which analogy is similar to a DC 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. What is DC short for?

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


Question 4. What is the mains potential difference and frequency in the U.K?

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


Question 5. Which analogy is similar to an AC supply?

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


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