Electrical Systems
What is needed to create a electrical circuit?
What is a fuse, load, switch, wires, and power?
Protects the circuit by limiting current at a predetermined amperage.
What is a fuse and/or circuit breaker?
Define Ohm's law.
What is voltage equals current times resistance?
An electrical fault that will cause current to decrease.
What is excessive resistance?
What is a good reading of a relay coil?
What is 60-100 Ohm's.
What voltage should you read when connecting a DMM to a fully charged automotive battery?
An electrical component that controls high current loads with low current.
What is a relay?
The same measurement as 1,000,000 Ohms
What is a Mega Ohm?
A circuit fault that will cause a high amperage fuse to blow immediately.
What is a short to ground before the load?
When testing a Left front fog light and it doesn't turn on what might you test first?
What is Fuse, Relay, or Power source.
What is the normal charging voltage RANGE while the engine is running?
What is 13.5V - 14.5V?
What electrical component limits the flow of current in an automotive electrical circuit?
What is a resistor?
The type of current that is most commonly used in automotive applications.
What is DC current? (Direct current)
Causes a negative voltage reading on a multimeter.
What is reversed multimeter leads?
A customer comes in with a complaint about their LR break light isn't working you test it and it turns on however it is less bright than the other break light what might be the issue?
What is high resistance.
A vehicle networking system that communicates using one wire (CAN-bus).
What is multiplexing?
A variable resistor that uses three connections, one at each end of the resistance and one connected
to a sliding contact with the resistor.
What is a potentiometer?
Contains a permanent magnet and a thin semiconductor layer, and operates on the principle that if current flows through thin conducting material and it is exposed to a magnetic field, another voltage is produced.
What is a Hall-effect switch?
A bulb with 12V and 5ohms resistance will have how many watts of power?
28.8 Watts
What is a rare type of electrical problem in the automotive context that can cause strange events such as unwanted circuit/component operation?
What is Short-to-Voltage?
What component inside an alternator converts A/C current to D/C current?
What is a diode trio/diode bridge?
A device that contains a moveable core that changes electrical energy to mechanical energy.
What is a solenoid?
The air inside the coil of wire of an electromagnet has very high reluctance and limits the strength of the magnetic field that can be produced, therefore...?
Why is an iron core placed at the centre of an electromagnet?
A switch with spring-loaded contacts. It may be either held open (normally open) until pressure is applied to the button, or held closed (normally closed).
What is a momentary contact switch?
A customer comes in with a blown 100Amp fuse on one of the main fuse blocks. After you replace the fuse, it blows again the next time you start the engine. What might be causing this?
An internal short in the starter motor.