Our VIP Package gets you every single course at 80% off the individual price. For a limited time, save an additional $100 with coupon code 100VIP. Learn more

Wiring Fundamentals: DC and AC

Watch This Course

$99.00 USD $49.50 USD

Or 8 weekly payments of only $6.19 Instant access. Easy checkout. No fees. Learn more
Course Access for Life
60 day money back guarantee

DC and AC


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.