LiTE 605 Small Engine Technology Quiz

Circuit Tester

• Used by mechanics to diagnose electrical malfunctions in vehicles.
• Essential tool for assessing and troubleshooting automotive electrical systems.
• Also known as voltage tester or test light, determines presence of electric current in a circuit.
• Ideal for checking car electrical circuits: headlights, taillights, fuses, and batteries.

Parts of Circuit Tester

• Probe: Makes contact with electrical circuit; pointed end pierces insulation.
• Indicator Light: Illuminates (usually LED) to show the circuit is live.
• Spring: Provides consistent pressure for reliable contact.
• Alligator Clip: Establishes temporary electrical connections with terminals/components.
• Spring Wire: Ensures electrical conductivity between devices.
• Connection Port: Securely connects tester to the circuit.

Operation of Circuit Tester

• Preparation: Ensure tester is functional by checking the indicator light.
• Connecting to Ground: Attach ground lead to a known ground (e.g., negative battery terminal).
• Testing the Circuit: At the test point, if live, indicator light will illuminate.
• Interpreting Results:
  • Light On: Voltage present; circuit is live.
  • Light Off: No voltage; possible circuit fault.

Digital Meter

• Used to measure voltage, resistance, and current in car electrical systems.
• A multimeter helps identify issues with wiring, components, and connections.

Parts and Functions of Digital Meter

• Red Meter Lead: Connects to voltage/resistance or amperage port; positive connection.
• Probes: Handles to hold tips on connections being tested.
• Tips: Connection points at the end of probes.
• Black Meter Lead: Always connected to common port; negative connection.
• Digital Display: Shows measured values.
• Meter Dial: Switch functions; turn to OFF after use.
• Panel Indicator: Displays function and setting ranges for the dial.
• Probe Connections: Specific for each measurement function.

Measuring Voltage with a Digital Meter

• Plug test leads into COM and V terminals; both AC and DC voltage can be measured.
• Set dial to voltage settings for AC or DC.
• AC Voltage: Measured for home appliances; typical in sockets and devices.
• DC Voltage: Common in battery-powered circuits and vehicles.
• Set voltage range higher than expected for accurate readings.
• Touch probes to both sides of a load or power source for measurement.

Test your knowledge on the use of circuit testers and digital meters in automotive technology. This quiz will cover their functions, parts, and safety procedures, as well as how to test continuity and voltage. Perfect for students in the Small Engine Automotive Technology course.