Deck 4: The X-Ray Circuit

Question 1

The property of a circuit that impedes the flow of electrons is

A) electric current
B) electric potential
C) resistance
D) electrostatics

Answer 1

resistance

Question 2

A volt is the ratio of work per unit of charge and is written

A) Joules/Coulomb
B) Coulomb/Joules
C) Watt/Coulomb
D) Coulomb/Watt

Answer 2

Joules/Coulomb

Question 3

As two charges get closer, the electrostatic force

A) is directly proportional to the amount of distance between them
B) is inversely proportional to the amount of distance between them
C) is inversely proportional to the square of the distance between them
D) is directly proportional to the square of the distance between them

Answer 3

is inversely proportional to the square of the distance between them

Question 4

Which of the following is NOT a correct law of electrostatics:

A) like charges repel
B) unlike charges attract
C) electric charges reside only on the internal surface of conductors
D) all of these are laws of electrostatics

Question 5

The unit of measurement of electrical charges (SI) is

A) Watt
B) Joule
C) Newton
D) Coulomb

Question 6

The study of stationary electric charges is

A) electromagnetism
B) electrodynamics
C) electronics
D) electrostatics

Question 7

The flow of electrons along a conductor is

A) electric current
B) electric potential
C) resistance
D) electrostatics

Question 8

If a conductor is curved, the greatest amount of charge will be found

A) at the beginning of the conductor
B) at the end of the conductor
C) at the area of the greatest curvature of the conductor
D) along the straightest area of the conductor

Question 9

Electricity is typically thought to be the same as

A) electromagnetism
B) electrodynamics
C) electronics
D) electrostatics

Question 10

One Coulomb is equal to the electrical charge of 6.25 *1018

A) electrons
B) protons
C) neutrons
D) nuclei

Question 11

The volt is the unit of measure for

A) electric current
B) electric potential
C) resistance
D) electrostatics

Question 12

To get electrons to flow along a conductor, there must be

A) an excess of negative charges at one end of the wire
B) an excess of negative charges at both ends of the wire
C) an excess of positive charges at one end of the wire, and an excess of negative charges at the other
D) an excess of positive charges at both ends of the wire

Question 13

The ability to do work because of a separation of charges is

A) electric current
B) electric potential
C) resistance
D) electrostatics

Question 14

A volt is the potential difference that will maintain a current of _____ ampere in a circuit with a resistance of ______ ohm.

A) 1; 2
B) 2; 1
C) 1; 1
D) 2; 2

Question 15

Electrification by induction requires that the two objects

A) are in direct, constant contact with each other
B) are not at all in contact with each other
C) contact each other and then separate
D) are as far apart as possible from each other

Question 16

The ampere is the unit of measure for

A) electric current
B) electric potential
C) resistance
D) electrostatics

Question 17

A material that has a large number of free electrons is a

A) good insulator
B) good conductor
C) poor conductor
D) All of these

Question 18

Rubbing a rubber rod with fur is an example of electrification by

A) contact
B) friction
C) induction

Question 19

The study of electric charges in motion is

A) electromagnetism
B) electrodynamics
C) electronics
D) electrostatics

Question 20

When there is movement of some of the electrons of an uncharged metallic object as it is brought into the electric field of a charged object, this is electrification by

A) contact
B) friction
C) induction

Question 21

The ampere is defined as ______ Coulomb passing by a point in ____ second.

A) 1; 1
B) 2; 1
C) 1; 2
D) 2; 2

Question 22

A(n) ______ is the electrical resistance between two points along a conductor that, when one volt is applied, produces 1 ampere of current.

A) amp
B) volt
C) ohm
D) Watt

Question 23

A 12-volt battery use 12 Joules of energy to move

A) 1 Coulomb of charge
B) 2 Coulombs of charge
C) 12 Coulombs of charge
D) 24 Coulombs of charge

Question 24

Rubber is

A) an excellent conductor
B) an excellent insulator
C) a weak conductor
D) a weak insulator

Question 25

Ohm's law can be written as

A) I = V/R
B) I = R/V
C) R = I/V
D) R = IR

Question 26

When a conductor is longer:

A) resistance decreases
B) resistance increases
C) resistance remains the same
D) none of these

Question 27

The 60 Hz of electricity flowing into homes in the U.S. characterizes

A) alternating current
B) indirect current
C) direct current
D) weak current

Question 28

Which of the following is NOT a good electrical conductor?

A) Gold.
B) Copper.
C) Glass.
D) Water.

Question 29

When a conductor is more twisted:

A) resistance decreases
B) resistance increases
C) resistance remains the same
D) none of these

Question 30

Which of the following materials is a good conductor?

A) Glass.
B) Copper.
C) Plastic.
D) All of these are good conductors.

Question 31

Glass is an example of a(n)

A) insulator
B) conductor
C) material that allows the flow of electrons
D) inductor

Question 32

When a metallic conductor is colder:

A) resistance decreases
B) resistance increases
C) resistance remains the same
D) none of these

Question 33

Ohm's law can be written as

A) amps = volts *ohms
B) volts = amps * ohms
C) ohms = volts * amps
D) none of these

Question 34

When a conductor has a smaller cross-sectional area:

A) resistance decreases
B) resistance increases
C) resistance remains the same
D) none of these

Question 35

A material that allows electrons to move is a(n)

A) volt
B) insulator
C) conductor
D) inductor

Question 36

Which of the following is NOT a good insulator?

A) Glass.
B) Gold.
C) Wood.
D) Ceramic.

Question 37

A material that resists the movement of electrons is a(n)

A) ohm
B) insulator
C) conductor
D) inductor

Question 38

Kilovoltage peak is abbreviated as

A) kP
B) kPk
C) kVPk
D) kVp

Question 39

Current that changes direction in the conductor is

A) alternating current
B) indirect current
C) direct current
D) weak current

Question 40

A battery produces

A) alternating current
B) indirect current
C) direct current
D) current that changes direction

Question 41

Which of the following devices allow the electricity to flow in one direction only?

A) Fuse.
B) Switch.
C) Transformer.
D) Diode.

Question 42

The lines of force in space associated with a magnet are called

A) lines of flux
B) dipoles
C) domains
D) lines of field

Question 43

A closed pathway of wires and related elements is a(n)

A) diode
B) fuse
C) rheostat
D) electric circuit

Question 44

The ability of a material to attract iron, cobalt, or nickel is called

A) electromagnetism
B) potential difference
C) magnetism
D) voltage

Question 45

The device that produces electrons through a chemical reaction is a

A) transformer
B) fuse
C) resistor
D) battery

Question 46

The purpose of grounding is to

A) provide a source for electricity
B) neutralize a charged object
C) replace the circuit breaker
D) none of these

Question 47

Magnetic field strength is measured in

A) tesla
B) ohms
C) Newtons
D) Joules

Question 48

An adjustable form of a resistor is the

A) rheostat
B) capacitor
C) switch
D) diode

Question 49

A circuit with elements that are arranged like a "bridge" or branching across a conductor is called a

A) series circuit
B) parallel circuit
C) bridge circuit
D) series-parallel circuit

Question 50

Which of the following does NOT open a circuit to keep the circuit and devices safe?

A) Fuse.
B) Resistor.
C) Circuit breaker.

Question 51

A device that temporarily stores charge is the

A) rheostat
B) capacitor
C) transformer
D) fuse

Question 52

Outside the magnet, the lines of flux travel from

A) north pole to south pole
B) south pole to north pole
C) east pole to west pole
D) west pole to east pole

Question 53

Inside the magnet, the lines of flux travel from

A) north pole to south pole
B) south pole to north pole
C) east pole to west pole
D) west pole to east pole

Question 54

Which of the following devices can increase or decrease voltage by a set amount?

A) Battery.
B) Capacitor.
C) Transformer.

Question 55

A material that is weakly repelled by a magnetic field is classified as

A) nonmagnetic
B) paramagnetic
C) ferromagnetic
D) diamagnetic

Question 56

The device that regulates the amount of current flowing in the circuit is the

A) battery
B) resistor
C) fuse
D) transformer

Question 57

Like poles of a magnet _________ each other and opposite poles ________ each other.

A) attract; attract
B) repel; repel
C) attract; repel
D) repel; attract

Question 58

When a switch is turned on, the electric circuit

A) is closed
B) does not allow electrons to flow
C) is opened
D) none of these

Question 59

The force of magnetic attraction varies

A) directly with the square of the strength of the poles
B) inversely with the square of the strength of the poles
C) directly with the square of the distance between the poles
D) inversely with the square of the distance between the poles

Question 60

A material that will conduct electricity, but not as well as good conductors, but also will insulate, but not as well as good insulators are called a(n)

A) excellent conductor
B) weak conductor
C) weak insulator
D) semiconductor

Question 61

Wood and plastic are considered:

A) nonmagnetic
B) paramagnetic
C) ferromagnetic
D) diamagnetic

Question 62

A material that is strongly attracted to a magnetic field is

A) nonmagnetic
B) paramagnetic
C) ferromagnetic
D) diamagnetic

Question 63

According to Faraday's Law of Electromagnet Induction, if the strength of the magnetic field is increased, _________ is also increased.

A) current
B) resistance
C) voltage
D) all of these

Question 64

A device that converts electrical energy to mechanical energy is a

A) motor
B) transformer
C) generator
D) electromagnet

Question 65

A step-up transformer results in

A) increased current
B) increased voltage
C) increased resistance

Question 66

The idea that electricity could be induced in a wire by moving it through a magnetic field was discovered by

A) Faraday
B) Roentgen
C) Tesla
D) Oersted

Question 67

Slowing down the speed at which the conductor passes through the magnetic field results in

A) increased electromagnetic induction
B) reduced electromagnetic induction
C) no effect on electromagnetic induction

Question 68

_______________ current is induced in the secondary coil when mutual induction takes place.

A) alternating
B) direct
C) neither of the above
D) both of the above

Question 69

A step-up transformer results in

A) decreased current
B) decreased voltage
C) decreased resistance

Question 70

A device that converts mechanical energy to electrical energy is a

A) motor
B) transformer
C) generator
D) electromagnet

Question 71

Mutual induction involves electricity being induced into a ______________.

A) primary coil
B) secondary coil
C) moving magnetic field
D) none of these

Question 72

A material that is weakly attracted to a magnetic field is

A) nonmagnetic
B) paramagnetic
C) ferromagnetic
D) diamagnetic

Question 73

An electromagnet includes:

A) a coil of wire
B) an iron core
C) a solenoid
D) all of these

Question 74

A step-down transformer results in

A) increased current
B) increased voltage
C) increased resistance

Question 75

With mutual induction, to induce voltage in the secondary coil, there must be

A) a physical connection between the two coils of wire
B) alternating current in the primary coil of wire
C) direct current in the primary coil of wire

Question 76

Reducing the number of coils in the wire will result in

A) increased electromagnetic induction
B) reduced electromagnetic induction
C) no effect on electromagnetic induction

Question 77

Self-induction is based on the concepts introduced in

A) Ohm's law
B) Lenz's law
C) Oersted's law
D) Faraday's law

Question 78

With self-induction, the secondary current

A) is in a secondary coil
B) is in the original coil
C) opposes the original current
D) is in the original coil and opposes the original current

Question 79

The idea that electricity flowing through a conductor produces a magnetic field was identified by

A) Faraday
B) Roentgen
C) Tesla
D) Oersted

Question 80

Increasing the strength of the magnetic field results in

A) increased electromagnetic induction
B) reduced electromagnetic induction
C) no effect on electromagnetic induction