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Additional resources for Technical Service Training Global Fundamentals Curriculum Training – TF1010011S Electrical Systems
40 Service Training Lesson 4 – Basic control devices Components Control devices Switches 1 Switches serve as OFF/ON devices in a circuit by opening or closing the circuit. Switches can be 2 manually controlled or operated automatically, based 3 on a circuit or vehicle condition. 4 Switches can be normally open (NO) or normally closed (NC). Normally open means the at-rest 5 position of the switch opens the circuit. Normally ELEC033-A/VF closed means the at-rest position of the switch closes the circuit.
Current passes through each load and returns to more loads you connect in series, the higher the total the battery through ground. Because there is only one resistance in the circuit and the lower the current flow. path for current in a series circuit, a break anywhere This means the amount of current flow in a circuit in the circuit (a break is known as an open circuit) depends on the amount of source voltage as well as stops current flow. the circuit resistance. Service Training 33 Operation Lesson 3 – Complete electrical circuit Series circuits (continued) Resistance in a series circuit 12V ELEC027-AVF Resistance (series circuit shown) To determine the total resistance in a series circuit, add the individual resistances together.
A hinged pawl switch is the simplest type of switch. It either opens or closes the circuit. Simple switch 1 2 3 4 5 In Hinged pawl switch Wiper Contact Out Switches have one or more poles (inputs) and throws (outputs). For example, a single-pole, double-throw switch has one input and two outputs. A ganged 1 switch has two or more wipers that operate in unison (mechanically linked) from a single control. The following illustrations show three types of switches. 2 ELEC052-A/VF Single Pole, Single Throw (SPST) switch 1 In 2 Out Service Training 41 Components Lesson 4 – Basic control devices Control devices (continued) 1 3 2 ELEC053-A/VF Single Pole, Double Throw (SPDT) switch 1 In 2 Out 3 Out 1 3 2 ELEC054-B/VF Double Pole, Double Throw (DPDT) switch 1 In 2 Out 3 Out 42 Service Training Lesson 4 – Basic control devices Components Momentary contact switch The momentary contact switch has a spring-loaded contact; the spring keeps the contact from completing 1 the circuit.