Electrical Circuits

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41 Terms

1

An electrical circuit contains, at a minimum

A voltage source, a load, and conductors to carry the electrical current

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2

A type of subatomic particle with a positive charge is a(n) ____

Proton

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3

Which of the following is considered an insulator

a. Gold

b. Copper

c. Silver

D. Porcelain

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4

The voltage commonly supplied to a residence by the local utility is ____

240 Volts

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5

Another term used for voltage is ____

emf

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6

The color band that represents tolerance on a resistor is the ____

4th band

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7

In a parallel circuit, the total resistance is ____ the smallest resistance.

less than

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8

Circuit continuity is checked using the ___ function of a multimeter.

ohmmeter

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9

The power in a circuit with 120 volts and 5 amps is ____

600 volts; 120 X 5; P=IE

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10

Current is measured in units called ____

amperes

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11

Joules are___

units of work

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12

All conductors have ___

Some resistance

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13

To find voltage when both current and resistance are known, use the formula ___

E=IxR

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14

A resistor with a color code of yellow, orange, red, and silver has a tolerance of

3870 - 4730 ohms

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15

Ammeters measure

Current

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16

The charged particles of an atom are called

Protons and Electrons

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17

Conductors have ____or fewer valence electrons

Three

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18

The sum of the difference in potential of all the charges in an electrostatic field is called ____

(EMF)Electromotive Force or Voltage

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19

Electric charge is measured in

Coulombs

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20

Resistance is measured in

Ohms

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21

Find the resistance when the voltage is 120v and the current is 6A

20 ohm; R=E/I; 120 / 6 = 20

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22

An electromagnetic device used to control a mechanical device such as a valve is called a_____

Solenoid

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23

A device containing one or more coils of wire wrapped around a common core is call a____

transformer

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24

A ____ is an electro-mechanical component used as a switching device

Relay

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25

The change in voltage across a component is called a____

Voltage drop

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26

A ____circuit has only one route for current flow

Series

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27

a ____ is a drawing in which symbols are used to represent the components in a system

Schematic

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28

A ___ is a component that normally opposes current flow in a DC circuit

Resistor

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29

____ is the rate of doing work or the rage at which energy is used or dissipated

Power

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30

_____ is a statement of the relationship between current, voltage, and resistance in an electrical circuit.

Ohms law

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31

An ___ is a material through which it is difficult to conduct an electric current

Insulator

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32

Consisting of two or more cells, ____ convert chemical energy into electrical energy.

Batteries

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33

The prefix used to indicate one million is___

Mega

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34

The prefix used to indicate one thousand is ____

Kilo

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35

____ is any substance that has mass and occupies space.

Matter

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36

An ____is a negatively charged particle that orbits the nucleus of an atom

Electron

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37

The outermost ring of electrons orbiting the nucleus of an atom is known as the ____

Valence Shell

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38

Found in the nuclei of atoms, ____ are electrically positive particles and ____ are electrically neutral particles

Protons; Neutrons

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39

The ____ is the center of an atom

Nucleus

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40

The ___ is the smallest particle of an element that will still retain the properties of that element

Atom

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41

The basic unit of measurement for electrical power is the ____

Watt

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