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# Wiring Fundamentals: DC and AC

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## DC and AC

### 01.10

 00:00 - The terms DC and AC are short for direct current, and alternating current. 00:05 What these terms refer to is the direction the current in our circuit is flowing. 00:09 In a DC circuit, the current direction is always the same. 00:12 The amount of current flowing might change, but the direction will always be constant. 00:17 In an AC circuit, both the amount of current flowing and the direction of flow can change or alternate. 00:23 From the previous modules, we have an understanding of how current will flow in response to an applied voltage. 00:29 Much like the water in our plumbing pipe will flow a higher pressure to a lower pressure, a current will flow from a high voltage to a low voltage. 00:38 If we swap which ends of our wire are connected to the battery positive and negative, the current will flow through the wire in the other direction. 00:45 This sounds simple, and it is, that's really all there is to it. 00:49 If we reverse the direction or polarity our voltage is applied in, the resulting current flow will also change direction. 00:56 The large majority of automotive electrical systems are DC. 00:59 But it's worth having a brief understanding of AC circuits. 01:02 Particularly later on when we come to discussing engine speed sensors.

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