Electrical Components
FIGURE 36-35
Fuses and relays in a fuse box.

Electrical components such as switches, fuses, circuit breakers, resistors, capacitors, and relays are all used in a circuit to modify or manage the flow of current Figure 36-35. Each component performs a specific task within the circuit and will be connected into its particular circuit. To ensure the components’ correct operation, they will often have terminals numbered or marked with the connections and be referenced in wiring diagrams or schematics.

Some components are polarity sensitive. This means they must be connected into the circuit with the correct polarity to each lead. For example, some capacitors, and most semiconductor components, are polarity sensitive. Polarity-sensitive components have the polarity marked on at least one connection to ensure that the user connects them into the circuit correctly.