AC & DC (OCR GCSE Physics A, Combined (Gateway Science Suite)): Flashcards
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Definition of direct current (DC)
Definition of direct current (DC)
Electric current flowing in one direction at constant voltage
DC graph appearance (current vs time)
DC graph appearance (current vs time)
Horizontal line
Definition of alternating current (AC)
Definition of alternating current (AC)
Electric current that reverses direction at regular intervals
AC graph characteristic
AC graph characteristic
Values alternate between positive and negative
Main benefit of AC
Main benefit of AC
Used for long-distance energy transmission
Why AC can be transferred efficiently
Why AC can be transferred efficiently
Easy to use transformer to increase/decrease P.D.
UK mains electricity frequency
UK mains electricity frequency
50 Hz
UK mains electricity P.D.
UK mains electricity P.D.
230 V
UK voltage fluctuation range
UK voltage fluctuation range
Between +230 V and -230 V
Times current changes direction per second in UK
Times current changes direction per second in UK
50 times per second
Oscilloscope function
Oscilloscope function
Used to see the pattern of an electrical current
Formula for frequency
Formula for frequency
Variable in frequency formula
Variable in frequency formula
Time of one cycle
DC supply graph behaviour
DC supply graph behaviour
Current remains constant over time
AC supply graph behaviour
AC supply graph behaviour
Current changes direction periodically over time