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Electrical Theory > Electrical Quantities and Ohm's Law > Flashcards

Electrical Quantities and Ohm's Law Flashcards

1
Q

Ampere

A

unit of measure for rate of current flow
1 A = 1 C/s

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2
Q

British Thermal Unit (BTU)

A

amount of heat required to raise 1 pound of water 1 degree F

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3
Q

Complete Path

A

path that exists in a circuit when it can be traced from one terminal of a power source to another

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4
Q

Conventional Current Flow Theory

A

theory that considers current to flow from positive to negative

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5
Q

Coulomb

A

quantity of electrons equal to 6.25 x 10E18

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6
Q

Electromotive Force (EMF)

A

electrical pressure
the fore that pushes electrons through a wire

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7
Q

EMF aka

A

voltage

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8
Q

Electron Flow Theory

A

electricity flows from negative to positive

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9
Q

Grounding conductor

A

conductor that is used to force a piece of equipment to exist at ground potential; usually green in colour

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10
Q

Horsepower

A

measure of power for electrical and mechanical devices

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11
Q

1 hp equals how many watts

A

746 W

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12
Q

1 hp equals how many ft-lbs/s

A

550 ft-lbs/s

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13
Q

Impedance

A

the total opposition to current flow in an electric circuit

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14
Q

Joule

A

basic unit of electrical energy
amount of work done when 1 A flows through 1 Volt for 1 second

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15
Q

Neutral conductor

A

grounded conductor of a power system
connected to ground potential and is considered to be a current-carrying conductor

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16
Q

Ohm

A

unit of measure for electrical resistance

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17
Q

Ohm’s law

A

set of electrical laws that permits electrical quantities to be calculated mathematically

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18
Q

Potential difference

A

difference between positive and negative charges developed by a power source

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19
Q

Power is measured in what unit

A

watts

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20
Q

Power

A

describes amount of electrical energy converted to some other form

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21
Q

Resistance

A

opposition to current flow in an electrical circuit

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22
Q

Volt

A

measure of EMF
potential necessary to cause 1 C to produce 1 J of energy

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23
Q

Watt

A

measure of true power

24
Q

Coulomb’s law

A

force of electrostatic attraction or repulsion is directly proportional to the product of the2 charges and inversely proportional to the distance between them

25
Q

What is the SI unit of electrical charge

A

the coulomb

26
Q

1 Coulomb is defined as

A

the amount of electric charge that is transferred by a current of 1 ampere in 1 second

27
Q

1 Amp equals

A

1 C/s

28
Q

Conventional current flow theory

A

current flows from the positive terminal to the negative one

29
Q

Electron flow theory

A

current flows from the negative terminal to the positive

30
Q

In a circuit, what condition must be met for current to flow

A

there needs to be a complete path, aka a closed circuit

31
Q

Components of a basic circuit

A

load
switch
conductor
power source

32
Q

Short circuit

A

when there is little to no resistance in a circuit which leads to excessive current flow

33
Q

Voltage aka

A

potential difference
EMF

34
Q

The force that pushes the electrons through a wire is

A

the voltage

35
Q

What letter represents voltage in mathematical equations

A

E

36
Q

What happens when there is little to no resistance in a circuit

A

excessive amount of current flows causing a short circuit

37
Q

How are resistance and current related

A

they are inversely proportional
if R increases, current decreases and vice versa

38
Q

What is produced as current flows

A

heat

39
Q

Power formula

A

P = E x I
(power = volts times amps, or volts times current)

40
Q

calorie

A

amount of heat required to raise the temperature of 1 g of water by 1 degree C

41
Q

Ohm’s law: volts and amps

A

1 volt is required to push 1 Amp through 1 ohm

42
Q

Ohm’s law formula

A

E = IR
(volts = amps times resistance)

43
Q

A _________ ________ must exist before electricity can flow through a circuit

A

complete path

44
Q

A circuit with a complete path for electrical flow is called a ________ _______

A

closed circuit

45
Q

If a circuit path is incomplete or broken it is an ______ _____

A

open circuit

46
Q

Can electrons flow through an open circuit

A

no they cannot

47
Q

Volt/Voltage is also known as

A

electrical pressusre

48
Q

What does Ohm’s law state

A

the current flowing through a circuit is directly proportional to the voltage and indirectly proportional to the resistance

49
Q

Kilo

A

1,000

50
Q

Hecto

A

100

51
Q

Deca

A

10

52
Q

Deci

A

0.1 or 1/10

53
Q

Centi

A

0.01 or 1/100

54
Q

Milli

A

0.01 or 1/1000

55
Q

Micro

A

10E-6

56
Q

Mega

A

Million or 10E6

Electrical Theory (5 decks)

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