GCSE Physics: AC & DC Currents (2026/27) ⚡

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*** WHAT'S COVERED ***
1. Alternating Current (AC)
* The direction of current is constantly swapping back and forth.
* It is produced by an alternating potential difference.
* AC is represented by a sine wave on a voltage-time graph.
2. UK Mains Supply as an Example of AC
* The UK mains supply uses alternating current.
* It has a frequency of 50 Hz.
* The potential difference fluctuates between approximately +230/240 V and -230/240 V.
3. Direct Current (DC)
* The current always flows in the same direction.
* It is produced by a direct potential difference (which is constantly positive or negative).
* DC is represented by a straight horizontal line on a voltage-time graph.
* Examples of DC sources include cells and batteries.
4. Oscilloscopes
* These devices are used to display potential difference against time graphs for AC and DC.

*** CHAPTERS ***
0:00 Introduction to Alternating and Direct Current
0:19 What is Alternating Current (AC)?
0:58 UK Mains Supply Explained
1:45 What is Direct Current (DC)?
2:08 Using Oscilloscopes to Measure Current

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