AC & DC (OCR GCSE Physics A, Combined (Gateway Science Suite)): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the defining characteristic of direct current (DC)?
What is the defining characteristic of direct current (DC)?
Flows in one direction at constant voltage
How does the voltage behave in a direct current (DC) supply?
How does the voltage behave in a direct current (DC) supply?
It remains constant
What does a graph of voltage against time look like for DC?
What does a graph of voltage against time look like for DC?
A horizontal line
What is the defining characteristic of alternating current (AC)?
What is the defining characteristic of alternating current (AC)?
Reverses direction at regular intervals
How do values appear on a graph of AC voltage against time?
How do values appear on a graph of AC voltage against time?
Alternate between positive & negative
Why is AC used for long-distance energy transmission?
Why is AC used for long-distance energy transmission?
It can be transferred more efficiently
What is a key benefit of AC regarding transformers?
What is a key benefit of AC regarding transformers?
Easy to change P.D. using transformers
What is the frequency of UK mains electricity supply?
What is the frequency of UK mains electricity supply?
Hz
What is the potential difference of UK mains electricity?
What is the potential difference of UK mains electricity?
V
Between what values does UK mains voltage fluctuate?
Between what values does UK mains voltage fluctuate?
V and V
How many times per second does UK mains current change direction?
How many times per second does UK mains current change direction?
times
What is an oscilloscope used for?
What is an oscilloscope used for?
To see the pattern of electrical current