A6 ASE Certification
Potential voltage is read at a point where it’s about to be used, one example would be an open switch, where there is voltage only at one point of the switch and not the other side of the switch. Basically it sits there at a particular point before that voltage is applied to a circuit. At this point there is no current flowing and there is no voltage drop across that particular load. Remember when you have an open circuit there is no current flowing in that circuit. Also there is no voltage drop across a load when you have an open circuit.
A6 ASE CERTIFICATION VOLTAGE DROP:
The only way to have a voltage drop across a load, there has to be current flowing, without current flowing the load can not drop voltage. Remember a voltage drop checks for resistance,performing a voltage drop is the best way to check for resistance across a connector, feed side circuit or ground circuit. Here is an example: Lets say you are performing a voltage drop across a connector or a ground circuit and the voltage is above specifications. This indicates excessive resistance and will rob the dedicated component of voltage. Now that component will not work as it was design so then operation of that component will be affected. An example would be a light circuit with high resistance on the ground circuit, so now the light will glow dim. A high voltage drop across an connector inline to a blower motor or fuel pump will also cause problems. The fuel pump or blower will have less voltage and current so now it will move slower then normal, a slow moving fuel pump the vehicle runs lean. A slow moving blower motor equals less air flow. Another example would be a power window motor or alternator that has high resistance. In this case the window will move up or down slower or the alternator will not charge the battery, do to the of lost voltage.
A6 ASE CERTIFICATION CAN SYSTEMS
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