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http://www.youtube.com/watch?v=E27XDNf2c xc Ohm’s Law explains the relationship between voltage (V or E), current (I) and resistance (R) Used by electricians, automotive technicians, stereo installers It is the push or pressure behind current flow through a circuit, and is measured in (V) volts. Current refers to the quantity/volume of electrical flow. Measured in Amps (A) Resistance to the flow of the current. Measured in Ohms 1. Assuming the resistance does not change: As voltage increases, current increases. as voltage decreases, current decreases. 2. Assuming the voltage does not change: As resistance increases, current decreases. As resistance decreases, current increases. What is Voltage? What is Current? What is Resistance? http://www.youtube.com/watch?v=eZ9Xk0Ll n5Y&feature=related Stop at 1 Min mark V (E) = I x R I=V R R=V I Battery voltage is 12V Current is Amp ? Resistance 2 Ohm Voltage is 12V Current is 4 Amps Resistance Ohms ? Multi meters/ DVOM Why do we need resistors To decrease the amount of voltage applied to a component The value of the resistor is marked on the body using coloured rings What is Voltage? What is Current? What is Resistance? http://www.youtube.com/watch?v=nj7ewZmG3 eo&feature=related http://www.youtube.com/watch?v=YB_JCU w9SoU&feature=related What is a load It is a any electric load on a circuit that does work. Example: Power windows, light bulbs, motors. Series circuit : One pathway for current to flow. Example: Old Christmas lights More then one path way for current to flow. Used in most electrical vehicle circuits. 12 What is Voltage? What is Current? What is Resistance? What are wiring diagrams? What are the different circuits and there characteristics?