Basic Electrical Tests
What effect does an open circuit have on current?
Stops the flow of current
A 12-volt automotive battery that is fully charged has _____ cells that produce an open circuit voltage of _____ volts.
6, 12.6
What is used to connect the battery circuit to the starting circuit?
Starter solenoid
The alternator is a device for changing mechanical energy into _____ energy.
Electrical
Before a charging system load test is performed, the condition of the _____ should be checked.
Battery
If a live wire is shorted to ground, what will usually happen in the circuit?
Fuse will burn open (blown fuse)
When a 12-volt automotive battery is overcharged, _____ gas can collect around the top of the battery and explode if exposed to a flame or spark.
Hydrogen
The main parts of a 12-volt starting system equipped in a standard vehicle are a 12-volt battery, ignition switch, starter solenoid, _____, starting motor, and engine control module.
Starter Relay
A diode is an electronic device that _____.
Allows current flow in only one direction
In most late-model vehicles, a(n) _____ controls the amount of current flowing through the rotor’s field windings.
ECM
A voltage drop measurement determines the _____ of a wire or component.
Electrolyte used in a 12-volt lead-acid battery is a mixture of distilled water and _____.
Sulfuric acid
A(n) _____ converts electrical energy from a vehicle’s 12-volt battery into mechanical energy to crank the engine.
Starting Motor
The drive belt links the engine _____ pulley with the alternator pulley to drive the alternator.
Crankshaft
When fast-charging a 12-volt lead-acid battery, you should never exceed a maximum charge rate of _____ amps to prevent accidents.
50 Amps
A vehicle circuit problem that only occurs under certain conditions is called a(n) _____.
intermittent problem.
What is a parasitic draw?
A draw on the battery with the ignition off
The design of a(n) _____ allows a starter pinion gear to spin in one direction to turn the ring gear for starting and freewheel in the opposite direction once the engine starts.
Overrunning-Clutch
The _____ in an alternator is located in the center of the alternator housing and creates a rotating magnetic field.
Rotor
A gear reduction starter uses a _____ to increase the torque produced by the starting motor.
Planetary Gearset
What might make a bulb illuminate dimly or a motor run slowly in an electrical circuit?
High resistance
A battery _____ test determines whether current is unintentionally discharging across the top of a 12-volt battery cover.
Leakage
What is the rotating component inside a starter called?
(not the pinion gear)
Starter Armature
The alternator _____ changes alternating current into direct current
Rectifier
When using an ammeter to check the condition of a motor, a high amperage reading might indicate _____.
Bad armature bearings