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

Question 2. What would an AC supply look like on an oscilloscope? A straight line remaining at a single non-zero potential difference over time. A wave going from positive to negative 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.

Question 3. Which analogy is similar to an AC supply? 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. The wind blowing in different directions every day.

Question 4. What is the mains potential difference and frequency in the U.K? 230V, 60Hz. 230V, 50Hz. 110V, 60Hz. 110V, 50Hz.

Question 5. If an AC supply flows back and forth 3,000 times per minute what is its frequency? 50Hz. 180,000Hz. 60Hz. 3,000Hz.

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