EMC Chapter 1

Question 1

All matter consists of an organized collection of ___.

Answer 1

Atoms

Question 2

A(n) ___ is a particle contained in the nucleus of an atom that has a positive electrical charge.

Answer 2

proton

Question 3

The electrical term used to describe the opposition to electron flow is ___.

Answer 3

Resistance

Question 4

The sources of energy used to produce electricity are coal and ___.

Answer 4

Nuclear power; natural gas; oil (D: All the above)

Question 5

Ohm’s law states that voltage in a circuit is equal to ___.

Answer 5

Current times resistance

Question 6

___ is the addition of impurities to the crystal structure of a semiconductor.

Answer 6

Doping

Question 7

A(n) ___ is an electronic component that allows current to pass through it in only one direction.

Answer 7

diode

Question 8

Common power sources that directly produce DC voltage are ___.

Answer 8

Batteries; fuel cells; photovoltaic cells (D: all the above)

Question 9

___ current flow is current flow from negative too positive.

Answer 9

Electron

Question 10

___ are used to avoid long expressions of units that are smaller or larger than the base unit.

Answer 10

Prefixes

Question 11

___ and other electrical components can be connected in series.

Answer 11

Fuses; switches; loads (D: all the above)

Question 12

The ___ in a circuit containing series-connected loads is the same throughout the circuit.

Answer 12

current

Question 13

The total resistance in a circuit containing series-connected loads equals the ___ of the resistances of all loads.

Answer 13

sum

Question 14

A(n) ___ connection has two or more components connected so there is more than one path for current flow.

Answer 14

parallel

Question 15

The total resistance in a circuit containing parallel-connected loads is ___ the smallest resistance value.

Answer 15

less than

Question 16

A(n)___connection is a combination of series- and parallel- connected components.

Answer 16

series/parallel

Question 17

The total voltage applied across loads connected in series is ___ across the individual loads.

Answer 17

divided

Question 18

Photovoltaic cells are rated by the amount of ___ they convert.

Answer 18

energy

Question 19

In addition to the maximum voltage, each photovoltaic cell may produce up to ___ mA of current

Answer 19

40

Question 20

The photovoltaic effect is measured using a high-impedance voltage-measuring device such as a ___.

Answer 20

digital multimeter

Question 21

A magnet is a substance that produces a magnetic field and attracts ___.

Answer 21

Iron

Question 22

A ___ magnet is a magnet that retains only trace amounts of magnetism after the magnetizing force has been removed

Answer 22

temporary

Question 23

Permanent magnets may be demagnetized by a sharp blow are by ___.

Answer 23

heat

Question 24

___ is the magnetism produced when electric current passes through a conductor.

Answer 24

Electromagnetism

Question 25

The direction in which current flows through a conductor determines the ___ of the magnetic field around it.

Answer 25

direction

Question 26

In an inductive circuit, the current lags the ___.

Answer 26

Voltage

Question 27

___ is the ability of a component or circuit to store energy in the form of an electrical charge

Answer 27

Capacitance

Question 28

The unit of capacitance is ___.

Answer 28

farads (F)

Question 29

An inductive circuit is a circuit in which ___ lags voltage.

Answer 29

current

Question 30

Inductance is normally stated in ___.

Answer 30

henrys (H)

Question 31

___ power is the actual power used in an electrical circuit.

Answer 31

True

Question 32

True power is measured in ___.

Answer 32

watts (W)

Question 33

The relationship between power, voltage, and current may be visualized by presenting the power formula in ___ form.

Answer 33

pie chart

Question 34

The power formula states that power (P) in a circuit is equal to voltage (E) ___ current (I)

Answer 34

times

Question 35

The power formula states that voltage (E) in a circuit is equal to power (P) ___ current (I)

Answer 35

divided by

Question 36

The power formula states current (I) in a circuit is equal to power (P) ___ voltage (E).

Answer 36

divided by

Question 37

___ power is power absorbed and returned to a load due to its inductive and/or capacitive properties.

Answer 37

Reactive

Question 38

___ power is a combination of true and reactive power.

Answer 38

Apparent

Question 39

Ohm’s law is used in circuits that contain ___.

Answer 39

impedance

Question 40

___ represents a load or circuit that includes both true power and reactive power.

Answer 40

Power factor