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. What is DC short for?

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


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

A straight line remaining at a potential difference of zero over time.
A wave going from positive to negative over time.
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.


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

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


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

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


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

A wave going from positive to negative over time.
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 curved line starting at a high positive potential difference then steadily falling to zero.


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