• Describe what is meant by direct current (DC) and alternating current (AC).

• Use an oscilloscope trace to work out features of an AC supply.

What is meant by AC and DC current and how to use an oscilloscope trace to determine the features of an AC supply.

The current from a cell is a direct current (DC).

In AC, the current is constantly changing direction. The benefit of AC is that it is very easy to use a transformer to increase or decrease the potential difference. In the UK, the alternating current has a frequency of 50 Hertz (Hz) and a potential difference of around 230 volts.

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