An electrical relay is a switch that is operated by an electrical signal rather than by hand. Inside a typical relay, a small current flows through a coil, creating a magnetic field that moves a contact, opening or closing another circuit. This allows a low-power signal to control a higher-power circuit safely. Relays are commonly used to automate systems and protect equipment. For example, they can turn devices on or off remotely and help isolate sensitive control circuits from high voltages

Amperage, measured in amperes (amps), is the amount of electric current flowing through a circuit—essentially how many charged particles pass a point per second. It’s one of the basic quantities in electricity, alongside voltage and resistance. You’ll see amperage specified on things like household circuit breakers, electrical appliances, power supplies, and wiring ratings. It’s important because it helps determine how much load a circuit can safely handle without overheating or causing damage.

Watt’s Law describes the relationship between power, voltage, and current in an electrical circuit. It states that electrical power (measured in watts) is equal to the voltage multiplied by the current: P = V × I This means the amount of power used depends on how much electrical pressure (voltage) is applied and how much current is flowing. Watt’s Law is commonly used to calculate power consumption in devices, size electrical components, and understand energy usage in circuits.

Ohm's Law is a fundamental principle in electricity that describes how electric current flows through a conductor. In simple terms, it states that the current (I) flowing through a circuit is directly proportional to the voltage (V) applied across it, and inversely proportional to the resistance (R) of the circuit.

In electrical contexts, “switching terminology” refers to the specific words used to describe how circuits are turned on, off, or changed between states. It is also used to break down the characteristics of the switch when deciphering an electrical circuit. Switches come in various forms from the basic toggle switch, circuit breakers and isolators to relays.

A universal joint (U-joint) is a mechanical coupling that allows two rotating shafts to transmit power even when they are not perfectly aligned. It can handle angles between the shafts, letting motion pass smoothly despite changes in direction or movement.

A grease zerk (also called a grease fitting or nipple) is a small metal fitting installed on machinery that allows lubricant to be injected directly into moving parts using a grease gun. It has a one-way valve that lets grease in but keeps dirt and contaminants out.

This course teaches the essential skills required to safely remove and replace a vehicle wheel in the event of a flat tyre. Students will learn how to identify the correct tools, including a jack, wheel brace, and spare wheel, and how to use them properly.

This course introduces the correct and safe use of a tyre inflator for maintaining proper tyre pressure in vehicles. Participants will learn how to check tyre pressure using a gauge, understand recommended pressure levels, and identify where to find this information on a vehicle.

A pre-start (or pre-start check) is a routine inspection carried out before operating a vehicle, machine, or equipment to make sure it is safe and ready to use. The purpose of a pre-start is to identify problems early, prevent accidents, and ensure safe operation before starting the equipment.