b'an AutomotiveTechInfo.com publicationJaguar Diagnostics: Measurement and Signatures IntelligenceCircuit Analysis or Diagnostic Info Paralysis: You Decide Using Current for Faster, More Targeted DiagnosticsThink about the root of automotive electrical diagnosis for just a moment.pushes the electrons through the circuit, providing the ability to perform In our business, most of the focus is on the volts. What I mean by this is thatelectrical work. Until we switch that circuit on or connect the circuit to a most of our training, lab scoping and testing, and our diagnostic pathwayload, that voltage potential is thereand we can measure itbut it does in service information, focuses mainly on voltage. Why is that? It is theabsolutely no work. current that does all the work. Whether running a fuel pump, a lamp bulb,However, once we switch on the load, instantaneously, as the electrons or a very low current sensor signal, it is the current that does the work. Thebecomemagneticallychargedandalignedtotheirpowersource,those YROWDJH\x03LV\x03RQO\\\x03D\x03SRWHQWLDO\x03SUHVVXUH\x03GLHUHQFH\x03EHWZHHQ\x03WZR\x03SRLQWV\x11\x03 electrons are then unleashed to travel through the load toward the potential, In other words, any measured voltage potential is simply the magnitude ofand we now have an electrical current. The current is either magnetically electrical force available (in units of volts) with respect to positionmeaningpolarized (N +) or (S -) in DC power sources or magnetically alternating measured betweenpoints A & B. Voltage is the electrical pressure thatback and forth from North to South polarities in AC power sources.7 8'