Electrical Systems Safety Quiz

Circle the safety considerations required when working on electrical systems:

• keep sparks or flames away from batteries as gases given off are highly flammable

• remove jewelry to prevent high current shorting against wiring or connections

• use lower amperage replacement fuses to reduce fire risks when a fuse has blown

• gloves should be worn while handling battery acid or as directed by hybrid vehicle work procedures

• do not touch high voltage ignition terminals or remove ignition leads with the engine running

Which of the following is true regarding airbags?

• Their wiring/insulation is usually yellow in colour

• It is recommended airbags be disarmed when working in the area near them

• Follow the manufacturer’s procedure if removing a steering wheel fitted with an airbag

• All of the above are correct

Special manufacturers safety procedures must be followed due to high voltages found in:

• electronic ignition systems

• battery electric and hybrid vehicles

• common rail diesel fuel injection system engines

• all of the above

Chemical action within a vehicle battery is used to produce direct current

• True

• False

Current flow is the movement of electrons through components and wiring in a circuit

• True

• False

The current produced by rotating a magnetic field inside a coil of wire is alternating current

• True

• False

A 12 volt vehicle electrical system uses direct current from the battery while the engine is stopped but 24 volts AC with the alternator charging, once the engine is running

• true

• False

A vehicle wiring harness has many wires bundled together, wrapped in insulating material and also uses a rubber grommet where the harness passes through body panels.

• True

• False

Which electrical component is used to provide battery voltage to a high current headlight or spotlight but only uses a low switching current?

• voltage regulator

• thermal circuit breaker

• relay

• body control module

Where a vehicle electrical system gets its power supply from when the engine is switched off.

• Alternator

• Starter motor

• Battery

• Ignition coil