

Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
A comprehensive set of questions and answers covering fundamental concepts in electricity, including electrical shock, burns, safety practices, resistors, circuit protection devices, and electromotive force. It is a valuable resource for students studying basic electrical principles.
Typology: Exams
1 / 3
This page cannot be seen from the preview
Don't miss anything!


What are the 3 factors of electrical shock? - ANS--Amount of current -Path of current -Length of time Types of burns from electrical shock: - ANS--electrical burn -arc burn -thermal contact burn electrical burn - ANS-current flows through tissue and bone arc burn - ANS-current jumps from area of high resistance to low resistance *doesn't require contact with source thermal contact burn - ANS-directly touching the electrical source 3 causes of electrical accidents - ANS--unsafe equipment/installation -unsafe workplace environment -unsafe practices Variable resistors - ANS--Potentiometers(low current flow, wide range of values) -Rheostats(high current flow, limited value range) What is power measured in? - ANS-watts watt - ANS-amount of power used if 1 amp flows through an electrical potential of 1 volt wattage rating - ANS-max power a device can handle Resistor Stripe Color Code - ANS-0-Black 1-Brown 2-Red 3-Orange 4-Yellow 5-Green 6-Blue 7-Violet 8-Gray 9-White 5% -Gold
10% -Silver 20% -None Resistor Formula Code - ANS-1st band- 1st sigfig 2nd band- 2nd sigfig x 3rd band- exponent on 10 4th band- +or- % Circuit protection device purpose - ANS-to break connection when current flow is excessive current rating - ANS-how much circuit can handle before it pops voltage rating - ANS-voltage it can handle before it arcs fuse - ANS-designed to open circuit and stop current if it exceeds certain value *can't be reused when is a standard fuse used? - ANS-when surge is not expected, but fast-acting is not required when is a time delay fuse used? - ANS-surge is expected, used for motors, solenoids, and transformers when is a fast action fuse used? - ANS-used to protect very sensitive instruments and semiconductor devices trip-free circuit breaker - ANS-won't reset until issue is fixed non trip-free circuit breaker - ANS-can be reset even if problem isn't fixed *used for essential aircraft flight functions switch - ANS-electrical control device used for opening, closing, or changing connection in electrical circuit poles - ANS-# of terminals current can enter switch throws - ANS-# of circuits that can be controlled by each pole protection against electrical shock - ANS--removes metal+jewelry -guard unsafe spaces -grounding -safe practices 2 most common protection devices - ANS--fuse -circuit breaker