Electrical Units

Question 1

What is a volt?

Answer 1

The movement of charge carriers caused by potential difference between poles.(EMF)

Question 2

What is produced by the potential difference between two poles?

Answer 2

Electric field

Question 3

What’s another name for two electrically charged poles?

Answer 3

Electric dipole

Question 4

What is an amp?

Answer 4

The current of electricity divided by the resistance of its flow.
Volts/Ohms

Question 5

How many coulombs are in 1 ampere?

Answer 5

1

Question 6

What happens to the total amperage as resistance increases?

Answer 6

It decreases.
Ex: 10 amps × 2 ohms = 5 amps

Question 7

Is current inversely proportional to resistance?

Answer 7

Yes

Question 8

AWG

Answer 8

American wire guage

Question 9

What happens as the size of a conductor increases?

Answer 9

The resistance increases

Question 10

What does a resistor do?

Answer 10

Introduces a certain resistance

Question 11

What is superconductivity?

Answer 11

Cooling substances to eliminate resistance.

Question 12

What would happen if scientists finally cooled substances to absolute zero?

Answer 12

We’d have an absolutely perfect conductor.

Question 13

What is the abbreviation for conductance?

Answer 13

Italicised G

Question 14

What happens to conductance as resistance drops?

Answer 14

It increases. The values are inversely proportional to eachother.

Question 15

What abbreviation do engineers use for conductance?

Answer 15

Italicised uppercase G

Question 16

What abbreviation do engineers use for resistance?

Answer 16

Italicised uppercase R

Question 17

What is the reciprocal of G

Answer 17

1/R

Question 18

What is the reciprocal of R

Answer 18

1/G

Question 19

What is the conductance of a material with 50 ohms?

Answer 19

1/50 or .02 Siemens or G

Question 20

What unit do we measure the heat of a circuit with?

Answer 20

Watt

Question 21

What abbreviation represents watts?

Answer 21

P

Question 22

What equation measures watts?

Answer 22

Amperage through the resistor×voltage across the resistor

Question 23

What is energy measured in?

Answer 23

Joules

Question 24

Define energy.

Answer 24

Power dissipated over a period of time.

Question 25

Define power.

Answer 25

The instantaneous rate energy is expended at a particular moment in time.

Question 26

Do we italicize abbreviations for units and things?

Answer 26

Nope

Question 27

Do we italicise mathematical terms for constants?

Answer 27

Yes

Question 28

Do we italicise abbreviations for electrical quantities?

Answer 28

Yup

Question 29

How do we figure volts from watts and amps?

Answer 29

Volts=watts/amps

Question 30

How do we figure amps from watts and volts?

Answer 30

Amps=watts/volts

Question 31

What is an erg?

Answer 31

.0000001 of a joule

Question 32

What is a btu?

Answer 32

British thermal unit

Question 33

What is a btu equivalent to?

Answer 33

1055 joules

Question 34

What is an eV

Answer 34

Electron-volt

Question 35

How many joules of energy are in an eV

Answer 35

1.6×10^-19

Question 36

How do physicists rate particle accelerators in terms of?

Answer 36

MeV or megaelectron volts

Question 37

In the US, how often does current reverse itself?

Answer 37

Once every 1/120 second

Question 38

What is the basic unit of AC frequency?

Answer 38

Hertz

Question 39

If an AC cycle repeats itself every 1/60 second, how many hertz is that an hour?

Answer 39

60 hertz

Question 40

What does a rectifier do?

Answer 40

Keeps current flowing in one direction.

Question 41

What is rectification?

Answer 41

Chang AC to DC

Question 42

What is a diode?

Answer 42

A recrifier

Question 43

What two things can we do with a rectifier?

Answer 43

Cut off (half-wave rectification) or invert (full-wave rectification) half the sinusoidal wave

Question 44

Do rectifiers cut current in half?

Answer 44

Not directly.

Question 45

What is a weber?

Answer 45

Quantity of magnetic field in units

Question 46

What is a weber equal to?

Answer 46

1 volt-second

Question 47

What is one maxwell

Answer 47

.00000001 webers

Question 48

What is flux density?

Answer 48

Area of a magnetic field

Question 49

What is flux density of one weber?

Answer 49

One tesla

Question 50

What is 1 Gauss

Answer 50

.0001 teslas

Question 51

How do engineers quantify magnetic field strength?

Answer 51

Ampere-turns

Question 52

What do ampere-turns quantify?

Answer 52

Magnetomotive force

Question 53

A one turn wire loop with 1 amp of current produces how many At's?

Answer 53

1 At

Question 54

Do you multiply the number of loops in a coil by amps to get Ampere-turns or At?

Answer 54

Yes