Understanding 12V Motor Vehicle Systems

What is the primary purpose of a wiring diagram in a motor vehicle?

• To show the physical layout of components

• To illustrate the electrical connections between components

• To provide a list of all components used

• To display the mechanical structure of the vehicle

Which of the following is a safety precaution when working with 12V electrical systems in vehicles?

• Always work with wet hands

• Disconnect the battery before starting work

• Use metal tools without insulation

• Ignore the colour coding of wires

What is the function of a fuse in a vehicle's electrical system?

• To increase the voltage

• To protect the circuit from overcurrent

• To decrease the current

• To store electrical energy

Which fuse rating would be most appropriate for a circuit with a normal operating current of 8A?

• 5A

• 10A

• 15A

• 20A

What is the typical voltage rating for automotive lighting systems?

• 6V

• 12V

• 24V

• 48V

Which component is used to convert electrical energy into light in a vehicle?

• Battery

• Alternator

• Bulb

• Fuse

What is the purpose of a relay in a vehicle's lighting system?

• To increase the brightness of the lights

• To allow a low current circuit to control a high current circuit

• To store electrical energy

• To decrease the voltage

Which of the following is a common type of bulb used in vehicle headlights?

• LED

• Incandescent

• Fluorescent

• Halogen

In a wiring diagram, what does a dashed line typically represent?

• A physical connection

• A mechanical linkage

• An optional connection

• A ground connection

What is the unit of measurement for electrical current?

• Volts

• Amperes

• Ohms

• Watts