Electrical Law & Math
The formula representing Ohm’s Law.
V=I X R
This meter setting measures electrical opposition and must only be used on a de-energized circuit
What is Ohms
A component that opens and closes a circuit using an electromagnetic coil.
What is a Relay?
The total resistance in a series circuit with three 10 ohm resistors
What is 30 Ohms
A meter reading of 0V across a closed switch indicates this circuit condition
What is normal operation / zero voltage drop?
A semiconductor component that allows current to flow in only one direction.
What is a Diode?
The power dissipated in a circuit running on 12 volts and 5 amps of current (Watts)
What is 60 Watts
The tool used to display voltage signals over time as a waveform
What is an Oscilloscope / Oscillograph?)
This variable resistor changes its resistance based on temperature.
What is a Thermistor / NTC / PTC?
Kirchhoff’s Current Law states that the current entering a junction must equal this
What is the current leaving the junction
A high-resistance fault on the ground side of a load causes this to happen to the available voltage across the load.
What is a voltage drop decrease / reduced available voltage?
Terminals 85 and 86 on a standard ISO 5-pin relay control this internal part
What is the relay coil?