Deck 12: Electric Current and Related Parameters

Question 1

In general, there are two ways in which the sun's energy is converted into electricity:

A)photovoltaic and photothermal
B)photovoltaic and photochemical
C)photovoltaic and photosynthetic
D)none of the above

Answer 1

A

Question 2

The law that states that at any given time, the sum of the currents entering a node must equal the sum of the currents leaving the node is know as

A)Kirchoff's current law
B)Kirchoff's voltage law
C)Ohm's law
D)Coulomb's law

Answer 2

A

Question 3

Which subatomic particle has no charge?

A)Proton
B)Neutron
C)Electron
D)Ion

Answer 3

B

Question 4

Ohm's law describes the relationship between voltage, resistance, and current.Which of these is Ohm's law?

Question 5

A numbering system that describes the size of an electric conductor is AWG.What does AWG stand for?

A)American Wire Gage
B)Association of Wire Gages
C)Atlas of Wire Gages
D)All Wires are Good

Question 6

Which subatomic particle has a positive charge?

A)Proton
B)Neutron
C)Electron
D)Ion

Question 7

Some materials exhibit near-zero resistance at very low temperatures.This behavior is called

A)infra-resistance
B)anti-resistance
C)semiconductivity
D)superconductivity

Question 8

Which subatomic particle has a negative charge?

A)Proton
B)Neutron
C)Electron
D)Ion

Question 9

Opposite charges repel each other and like charges attract each other.

Question 10

Electric current is a fundamental dimension.

Question 11

The SI unit for electric current is

A)amperes
B)electrons per second
C)coulombs
D)watts

Question 12

The amount of work required to move charge between two points is represented by

A)electric current
B)resistance
C)voltage
D)energy

Question 13

The flow of electric charge that occurs in one direction that is typically produced by batteries is known as

A)ac current
B)dc current
C)ac/dc current
D)unidirectional current

Question 14

Which of the following batteries is an example of a primary cell?

A)Nickel-cadmium (NiCd) also known as "nicad"
B)Nickel-metal hydride (NiMH)
C)Alkaline
D)Lead acid

Question 15

When it comes to wire size, the larger the gage number the larger the wire diameter.

Question 16

The flow of electric charge that periodically reverses direction that is typically produced by rotating generators is known as

A)ac current
B)dc current
C)ac/dc current
D)omni directional current

Question 17

In all batteries, electricity is produced by

A)light
B)heat
C)a chemical reaction
D)all of the above

Question 18

Electrical resistance is a fundamental dimension.

Question 19

The electrical resistance of a material varies with temperature.

Question 20

Primary cells are batteries that can be recharged while secondary cells are batteries that
cannot be recharged.

Question 21

The distribution of light on a horizontal surface is known as

A)luminescence
B)luminosity
C)illuminescence
D)illumination

Question 22

A common unit of illumination intensity is called a footcandle and is equal to

A)the amount of light one foot away from a candle.
B)the amount of light from a one-foot long candle.
C)one lumen distributed over an area of 1-square-foot.
D)none of the above

Question 23

In certain circuits, if one of the elements fails, that failure prevents the current from flowing through other elements in the circuit; thus the entire circuit fails.This type of circuit is a

A)parallel circuit
B)series circuit
C)none of the above

Question 24

Capacitors are used for

A)energy storage
B)electronic filters
C)timing elements
D)all of the above

Question 25

Electrical components that store energy on two oppositely charged electrodes, rather than through a chemical reaction are known as

A)batteries
B)inductors
C)transistors
D)capacitors

Question 26

Most indoor fluorescent light fixtures contain two or three 40-watt bulbs each.If a classroom
has 15 fluorescent light fixtures, each with three 40-watt bulbs, how much does it cost to leave
the lights on for a two-hour class? Assume the electric company charges approximately 10 cents
per kilowatt-hour.

Question 27

The ratio of how much light is produced by a lamp (in lumens) to how much energy is consumed by the lamp (in watts) is known as

A)efficacy
B)efficiency
C)illumination cost
D)energy cost

Question 28

In lighting design, a variable called CRI is often used.What does CRI stand for?

A)Crime Reenactment Investigation
B)Color Rendition Index
C)Capacitive-Resistive Index
D)none of the above