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AT 202 Exam 1: Electrical System Practice Questions & Answers.
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AT 202 Exam 1: Electrical System Practice Questions & Answers. what are the three elements of Ohm's Law? - CORRECT ANSWER ~Electromotive Force (E or EMF) ~Resistance (R) ~Current (I) what are the three types of electrical components? - CORRECT ANSWER ~Control devices (likes diodes and swi...

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  • December 12, 2024
  • 43
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • at 202 exam 1 electrical system practice question

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AT 202 Exam 1: Electrical System
Practice Questions & Answers.
what are the three elements of Ohm's Law? - CORRECT ANSWER ~Electromotive Force (E or EMF)

~Resistance (R)

~Current (I)



what are the three types of electrical components? - CORRECT ANSWER ~Control devices (likes diodes
and switches)

~Power consumers (like resistors)

~Power producers



what is current? - CORRECT ANSWER the movement (flow) of electrons through a conductor



what's the unit of quantity for electricity? - CORRECT ANSWER coulumbs



what is current measured by? - CORRECT ANSWER amperage (A)



one ampere is the rate of flow of...? - CORRECT ANSWER one coulomb per second



what is resistance a property of? - CORRECT ANSWER a conductor



what does a restrictor do? - CORRECT ANSWER oppose the flow of electric current



what is resistance measured in? - CORRECT ANSWER Ohms (Ώ)



do humans have a high or low resistance? - CORRECT ANSWER high

,what is electromotive force? - CORRECT ANSWER the pressure or force needed to produce electron
movement (flow)

~aka "voltage"



what's electromotive force measured in? - CORRECT ANSWER volts



what's the difference between voltage and volts? - CORRECT ANSWER ~*voltage* = electromotive force
= the force needed to produce electron movement

~*volts* = the force required for current to flow at 1 *ampere* through 1 *ohm resistor*



what is Ohms Law? - CORRECT ANSWER The current (electron flow) through a conductor is directly
proportional to the voltage (electrical pressure) applied to that conductor and inversely proportional to
the resistance of the conductor

~think of the triangle, E/(I x R)

~I = E/R



what's the relationship between voltage and current? - CORRECT ANSWER directly proportional



what's the relationship between resistance and current - CORRECT ANSWER inversely proportional



what's a control device? - CORRECT ANSWER a device used to control the flow of current



what's a power producer? - CORRECT ANSWER a device used to create current for the electrical circuit



what's a power consumer? - CORRECT ANSWER a device that uses current



what's an example of a control device? - CORRECT ANSWER diodes and switches



what's an example of a power producer? - CORRECT ANSWER generator

,what's an example of a power consumer? - CORRECT ANSWER radio



what are resistors made of? - CORRECT ANSWER metal wire or carbon



what's the mission of a resistor? (not just what it does) - CORRECT ANSWER maintain a stable resistance
over various environmental conditions



what does the length of a rheostat determine? - CORRECT ANSWER the strength of its resistance (longer
= stronger)



how do you read a resistor? - CORRECT ANSWER ~start at ring closest to the end

~take the first 3 numbers (from the first 3 bands) and multiply them by the fourth number (4th band)

~value of resistor x tolerance +/- resistor = acceptable range of resistor



what is a diode? - CORRECT ANSWER an electrical control device that limits current flow to one
direction



what's the main building block of semiconductors? - CORRECT ANSWER diodes



what are the two sides of a diode? - CORRECT ANSWER ~anode (positive side)

~cathode (negative side)



in a diode, which way does the current flow? - CORRECT ANSWER the direction of the arrow (flow must
be positive to negative, or else diode is blocking the flow)



on the diode symbol, what is the silver ring? - CORRECT ANSWER the cathode (part attached to the
negative side of the circuit)



what are the three features of a switch? - CORRECT ANSWER ~*contacts* (like SPDT)

~*ratings* (max voltage/current the switch can handle)

, ~*method of operation* (toggle, slide, key, etc.)



what is the method of operation of a light switch? - CORRECT ANSWER toggle



what's a pole? - CORRECT ANSWER the number of input contacts on a switch



what's a throw? - CORRECT ANSWER the number of output contacts *per pole* on a switch



what's a momentary switch? give an example - CORRECT ANSWER a switch that returns to its normal
(off) position when released

~ex: a toggle switch



what's an on-off switch? give an example - CORRECT ANSWER ~SPST

~ex: alternators switches



what's a momentary on-off switch? give an example - CORRECT ANSWER ~push to make SPST
momentarily

~aka Normally Open (NO)

~ex: engine starter



what's a dual on-off switch? - CORRECT ANSWER ~DPST

~a pair of on-off switches which operate together (shown on symbol by dotted line)



what's an on-on switch? give an example - CORRECT ANSWER ~SPDT

~two position switch, no off position

~controls a separate device on each throw

~ex: flaps (up in one position, down in the other position)



what's a push-push switch? - CORRECT ANSWER ~a special type of standard on-off switch (SPST)

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