P5 (Higher bits)

hannah.pickard
Quiz by , created about 6 years ago

Higher Science (5's) (Physics) Quiz on P5 (Higher bits), created by hannah.pickard on 04/22/2013.

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hannah.pickard
Created by hannah.pickard about 6 years ago
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Question 1

Question
Why do resistors get hotter when there is an electric current through them?
Answer
  • collisions between moving charges and stationary ions in the wire cause a heating effect
  • energy from the current is wasted as heat

Question 2

Question
Why does the potential difference across two or more components add up to the potential difference across the battery?
Answer
  • none of it is wasted
  • the work done in each unit of charge in the battery must equal the work done in the components

Question 3

Question
Why is the potential difference largest across the component with the most resistance?
Answer
  • more work is done by the charge moving through a large resistance than a smaller one
  • it takes more energy to move across a bigger resistance