Questions and Answers
Fuses and circuit breakers are rated in _____
Amps
There are many different types and configurations of switches, including all of the following EXCEPT:
A(n) __________ is an electrical device used to turn the current on and off in a circuit.
Switch
Fuses prevent circuit damage by:
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A(n) __________ is an example of a more complex switch, with three positions: center/off, down for one circuit on, and up for another circuit on.
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Who is correct: Technician A says relays are turned on and off by a small amount of current. Technician B says relays can be normally closed (NC) or normally open (NO).
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By using a small current in the relay winding, the contacts in the relay control:
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What does 87 or 5 stand for in the automotive relay terminal labeling systems?
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What does 30 or 3 stand for in the automotive relay terminal labeling systems?
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Who is correct: Technician A says that some relays have an internal switch that is normally open (NO). Technician B says that some relays have an internal switch that is normally closed (NC).
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A __________ uses magnetic fields to create rotary movement.
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What two components generate motion in an electric motor?
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Automotive wire is commonly a _____ copper core wrapped with _____ plastic insulation.
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The _______ uses a rating number; the larger the rating number, the ______ the wire and the lower its current-carrying capability.
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If a wire is described as being metric size of 8.0, it has a cross-sectional area of:
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Who is correct: Technician A says wire size is very important. Technician B says there are two scales used to measure wire size.
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Who is correct: Technician A says a modern automobile has more than 1 mile of wiring. Technician B says there could be more than 1,000 individual wires.
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Who is correct: Technician A says you should use a rosin core solder when repairing electrical circuits. Technician B says you should not overheat the repair.
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Solderless terminals are _____ to install and _____ at conducting electricity across joints that are designed to be disconnected.
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Who is correct: Technician A says that solder should be applied to the soldering iron tip while soldering. Technician B says that the solder should be applied to the wire joint while soldering.
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Who is correct: Technician A says that when soldering, the hotter the better, as it causes the solder to wick up the wires. Technician B says that the stripped ends of wires to be soldered should be laid parallel to each other to minimize resistance of the joint.
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The most effective and safest tool to use to strip insulation from electrical wire is a:
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When tracing and coloring a wire on a wiring diagram, coloring a wire(s) orange means that wire in the circuit is:
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Who is correct: Technician A says that wire colors are listed. Technician B says that connectors are listed.
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When tracing and coloring a wire on a wiring diagram, coloring a wire(s) orange means that wire in the circuit is:
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Who is correct: Technician A says wiring diagrams are like maps of the entire electrical system. Technician B says wiring diagrams have very little information and are not much help.
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Wiring diagrams give information about:
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Study Notes
Fuses and Circuit Breakers
- Fuses and circuit breakers are rated in amps, which are usually marked on the device.
- Fuses prevent circuit damage by stopping excessive current flow.
Switches
- Various types of switches include toggle switches, rotary switches, and push-button switches, but friction switches are not included.
- A switch is an electrical device used to turn current on and off in a circuit.
- Turn signal switches are complex switches with three positions: center/off, one circuit on, another circuit on.
Relays
- Relays operate with a small amount of current and can be normally closed (NC) or normally open (NO).
- Using a small current in the relay winding controls a larger current through the relay contacts.
- Automotive relay terminal 87 or 5 signifies a NO fixed contact to the common, while terminal 30 or 3 denotes the common-movable switch contact.
Resistors
- High wattage resistors use a ceramic form for dissipating heat.
- Variable resistors include rheostats, potentiometers, and thermistors.
- Resistors are often marked with four or five colored bands to indicate their value.
- NTC resistors decrease resistance as temperature increases.
Electric Motors
- The armature in an electric motor is an electromagnet.
- Electric motors utilize magnetic fields to create rotary movement, while relays and solenoids do not.
- Components generating motion in an electric motor are the armature and the field.
Wires
- Automotive wire typically has a multi-stranded copper core with seamless plastic insulation.
- The American wire gauge (AWG) system indicates that a larger rating number corresponds to a smaller wire with lower current-carrying capacity.
- A wire described as metric size 8.0 has a cross-sectional area of 8.0 mm.
Wiring and Soldering
- Modern automobiles can contain over 1 mile of wiring with more than 1,000 individual wires.
- Rosin core solder is recommended for electrical repairs, and care should be taken not to overheat the repair.
- Solderless terminals are quick to install and effective at conducting electricity across disconnect points.
- Solder should be applied to the wire joint, not the soldering iron tip, during the soldering process.
Wiring Diagrams
- Wiring diagrams are akin to maps of the electrical system and provide essential information regarding wiring colors and connectors.
- An orange wire in a wiring diagram indicates it is switched to power, whereas if it is marked as NOT switched to power, it has no active connection.
- Diagrams illustrate electrical circuits and their components, enhancing the understanding of complex systems.
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Description
Test your knowledge with these flashcards covering key concepts from Chapter 57 of Electrical Engineering. Topics include fuses, circuit breakers, switches, and more. Perfect for reinforcing learning and preparing for exams.
