AC & DC (OCR GCSE Physics A (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)?
It flows in one direction only
How does the voltage of a direct current behave over time?
How does the voltage of a direct current behave over time?
It remains constant
What does a DC voltage graph look like when plotted against time?
What does a DC voltage graph look like when plotted against time?
A horizontal line
What is the key feature of alternating current (AC)?
What is the key feature of alternating current (AC)?
It reverses direction regularly
How do voltage values appear on an AC graph?
How do voltage values appear on an AC graph?
They alternate 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 the frequency of UK mains electricity supply?
What is the frequency of UK mains electricity supply?
50 Hz
What is the potential difference of UK mains electricity?
What is the potential difference of UK mains electricity?
230 V
Between what values does UK mains voltage fluctuate?
Between what values does UK mains voltage fluctuate?
+230 V and -230 V
How many times per second does UK mains current change direction?
How many times per second does UK mains current change direction?
50 times
What is an oscilloscope used for?
What is an oscilloscope used for?
To see the pattern of a current