Basic Concepts Of Electricity

Front 1

"What is the SI derived unit of electric charge (amount of "charge")?"

Back 1

"Couloumb"

Front 2

"A couloumb is defined as the charge transported by a steady current of one ____ in one ____."

Back 2

"ampere / second (1C = 1A * 1s)"

Front 3

"What is dynamic electricity?"

Back 3

"The uniform motion of electrons through a conductor."

Front 4

"What is static electricity?"

Back 4

"An unmoving accumulation of electric charge."

Front 5

"What was the original reason for a charge being called "negative"?"

Back 5

"Because it was supposed to have a deficiency of the "fluid" that's transferred between objects rubbed together."

Front 6

"What was the original reason for a charge being called "positive"?"

Back 6

"Because it was supposed to have an excess of the "fluid" that's transferred between objects rubbed together."

Front 7

"An amp–hour (measure of amount of charge) is how many coulombs?"

Back 7

"3,600"

Front 8

"A mAh is how many coulombs?"

Back 8

"3.6"

Front 9

"What is the elementary charge?"

Back 9

"The charge of a single proton or electron."

Front 10

"Electrons that easily leave their respective atom and move about within a certain material are known as?"

Back 10

"free electrons"

Front 11

"The relative mobility of electrons within a material is known as?"

Back 11

"conductivity"

Front 12

"Materials with high electron mobility (many free electrons) are called?"

Back 12

"conductors"

Front 13

"Materials with low electron mobility (few or no free electrons) are called?"

Back 13

"insulators"

Front 14

"Define voltage."

Back 14

"Voltage is the measure of specific potential energy (potential energy per unit charge) between two locations."

Front 15

"Voltage is always measured between"

Back 15

"two points."

Front 16

"When a voltage source is connected to a circuit, the voltage will cause a uniform flow of electrons through that circuit called"

Back 16

"a current."

Front 17

"In a single (one loop) circuit, the amount of current at any point is"

Back 17

"the same as the amount of current at any other point."

Front 18

"If a circuit containing a voltage source is broken, the full voltage of that source will appear"

Back 18

"across the points of the break."

Front 19

"The +/– orientation of a voltage drop is called the"

Back 19

"polarity."

Front 20

"Like voltage, polarity is relative"

Back 20

"between two points."

Front 21

"The opposition to electric current is"

Back 21

"resistance."

Front 22

"The "friction" produced by electrons flowing against resistance manifests itself in the form of"

Back 22

"heat."

Front 23

"When a circuit is complete and has no breaks it is known as a"

Back 23

"closed circuit."

Front 24

"When a circuit contains breaks it is known as a"

Back 24

"open circuit."

Front 25

"When a switch is in the position that causes a break in the circuit is the switch open or closed?"

Back 25

"open"

Front 26

"When a switch is in the position that completes a circuit is the switch open or closed?"

Back 26

"closed"

Front 27

"What type of notation shows current moving from + to –?"

Back 27

"Conventional flow notation"

Front 28

"What type of notation shows current moving from – to +?"

Back 28

"Electron flow notation"

Front 29

"What does it mean for a device to be nonpolarized?"

Back 29

"It allows current to flow through it in either direction."

Front 30

"What does it mean for a device to be polarized?"

Back 30

"It only allows current to flow through it in one direction."

Front 31

"Do the arrows on polarized devices in schematics point in the direction of current flow or against?"

Back 31

"They point against current flow because they assume conventional flow notation."

Front 32

"The continuous movement of free electrons through the conductors of a circuit is called"

Back 32

"current"

Front 33

"The force motivating electrons to "flow" in a circuit is called"

Back 33

"voltage"

Front 34

"The opposition to motion of electrons through conductors is called"

Back 34

"resistance"

Front 35

"What is the symbol for current?"

Back 35

"I"

Front 36

"What are the symbols for voltage?"

Back 36

"E or V"

Front 37

"What is the symbol for resistance?"

Back 37

"R"

Front 38

"What is the unit of measure for current?"

Back 38

"Ampere ("Amp")"

Front 39

"What is the unit of measure for voltage?"

Back 39

"Volt"

Front 40

"What is the unit of measure for resistance?"

Back 40

"Ohm"

Front 41

"What is the unit abbreviation for current?"

Back 41

"A"

Front 42

"What is the unit abbreviation for voltage?"

Back 42

"V"

Front 43

"What is the unit abbreviation for resistance?"

Back 43

"Ω (Greek Omega)"

Front 44

"When do you use lower case for the mathematical symbols of electrical units of measure?"

Back 44

"When the quantity is described in brief periods of time. (A lightning strike for example.)"

Front 45

"What is the symbol for a coulomb?"

Back 45

"Q"

Front 46

"What is the unit abbreviation of a coulomb?"

Back 46

"C"

Front 47

"An amp is one ______ of electricity passing by a given point in one second of time."

Back 47

"coulomb"

Front 48

"The general SI unit for measuring energy is the"

Back 48

"joule"

Front 49

"In terms of electricity, a joule is defined as"

Back 49

"passing an electric current of one ampere through a resistance of one ohm for one second."

Front 50

"The relationship between volts and joules is"

Back 50

"1 volt is equal to 1 joule of electric potential energy per (divided by) 1 coulomb of charge."

Front 51

"A 9 volt battery releases __ joules of energy for every coulomb of electrons moved through a circuit."

Back 51

"9"

Front 52

"If you know the current and resistance in a circuit, how do you calculate the voltage?"

Back 52

"E = I * R"

Front 53

"If you know the voltage and resistance in a circuit, how do you calculate the current?"

Back 53

"I = E / R"

Front 54

"If you know the voltage and current in a circuit, how do you calculate the resistance?"

Back 54

"R = E / I"