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GCSE Combined Science · key term
Which of two terminals is positive and which is negative.
Used by OCR
Specification P6.2g · Physics Paper 2
Revise: Direct vs Alternating VoltageTo distinguish direct and alternating voltage, consider the polarity of the supply: which terminal is positive and which is negative, and whether this changes with time.
When comparing voltages, state that direct voltage keeps the same polarity, whereas alternating voltage repeatedly reverses polarity.
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