Deck 2: Voltage, Current, and Resistance

Question 1

The outermost shell of an atom is called the valence shell.

Answer 1

True

Question 2

The process of gaining a valence electron is known as ionization.

Answer 2

False

Question 3

Five coulombs of charge flow past a point in 0.5 seconds. How many amperes of current are flowing?

A) 15 A
B) 10 A
C) 20 A
D) 5 A

Answer 3

10 A

Question 4

In the neutral state all atoms contain the same number of protons and electrons.

Question 5

The rate of flow of free electrons in a conductive material is called:

A) voltage
B) coulomb
C) ampere
D) current

Question 6

Electrons are negatively charged particles, and are contained in the nucleus of the atom.

Question 7

The unit of electrical charge is measured in:

A) amperes
B) Coulombs
C) positive or negative charges
D) free electrons

Question 8

A resistor coded with Red-Violet-Black-Gold bands respectively, would be of what value and tolerance?

A) 27 Ω +/- 5%
B) 0.27 Ω +/- 5%
C) 2.7 Ω +/- 5%
D) 270 Ω +/- 5%

Question 9

The opposition to current is called:

A) conductance
B) insulators
C) resistance
D) ohms

Question 10

The best conductor in the following list is:

A) Silicon
B) Germanium
C) Silver
D) Copper

Question 11

The materials with the fewest free electrons are classified as:

A) semiconductors
B) silly putty
C) insulators
D) conductors

Question 12

The nucleus contains protons and electrons, each with an opposite charge.

Question 13

Current value depends on the amount of charge moving past a point in a unit of time.

Question 14

Which of the following is NOT a voltage source?

A) generator
B) solar cell
C) semiconductor
D) battery

Question 15

The copper atom contains 29 free electrons.

Question 16

A potentiometer is a:

A) 3-terminal device
B) variable resistor
C) voltage-control device
D) all of the above

Question 17

The smallest particle of an element that still retains the characteristics of the element is called an atom.

Question 18

The typical resistor to use for higher power applications would be the:

A) metal film
B) carbon-composition
C) wire wound
D) carbon film
E) metal oxide

Question 19

The movement of electrons between two points is called voltage.

Question 20

Valence electrons are tightly bound in insulators.

Question 21

The adjustable contact of a 1 k linear potentiometer is set at 3/4 of full rotation from the lower-end terminal. What is the resistance between the adjustable contact and the upper-end terminal?

A) 250 Ω
B) 1 kΩ
C) 750 Ω
D) 500 Ω

Question 22

What is the tolerance of a resistor manufactured to a minimum value of 5445 ohms and a maximum value of 5555 ohms?

A) 2%
B) 20%
C) 1%
D) 10%

Question 23

What is the most commonly used conductor in electronics?

A) copper
B) silver
C) aluminum
D) gold

Question 24

Which of the following is NOT needed to form an electric circuit?

A) conductive path for current
B) switch
C) voltage source
D) load

Question 25

The force that causes conductor electrons to move is:

A) resistance
B) conductance
C) current
D) voltage

Question 26

What is the maximum resolution of a 3 1/2-digit DMM when measuring volts?

A) 0.001 V
B) 0.01 V
C) 0.0001 V
D) 0.1 V

Question 27

DMM's are the most widely used type of electronic measuring instrument because of:

A) greater reliability
B) more functions provided
C) better accuracy
D) greater ease of reading
E) all of the above

Question 28

A green fifth-band on a precision resistor indicates a tolerance value of:

A) ±1%
B) ±0.5%
C) ±0.25%
D) ±2%

Question 29

If you need a 5.1 Ω resistor with +/- 5% tolerance, what color code should you look for?

A) GRN-BRN-GOLD-GOLD
B) BLU-BRN-BL-GOLD
C) GRN-BRN-BLK-GOLD
D) GRN-BLK-GOLD-GOLD

Question 30

Siemens is a unit for:

A) resistance
B) current
C) voltage
D) conductance

Question 31

A rheostat is a:

A) 3-terminal device
B) voltage-control device
C) variable resistor
D) all of the above

Question 32

The fifth band in a precision resistor represents the:

A) reliability
B) tolerance
C) multiplier
D) failure rate

Question 33

would NOT increase the resistance of the wire.

A) Use in a hotter environment
B) A smaller diameter wire
C) A lower AWG size wire
D) Winding pattern

Question 34

The negative and positive charge symbols are assigned in that order) to the:

A) proton and electron
B) electron and proton
C) electron and element
D) atom and nucleus

Question 35

Electrical current is defined as the movement of which subatomic particles?

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

Question 36

Which statement is NOT true?

A) A rheostat is a two terminal device
B) A potentiometer can be used as a rheostat.
C) A rheostat can be used as a potentiometer
D) A potentiometer is a three terminal device.

Question 37

If a fluid system is compared to an electrical system, the fluid pump will correspond to a:

A) generator
B) conductor
C) battery
D) both A and C

Question 38

To measure current with an ammeter, connect the ammeter:

A) across the voltage source
B) in the current path
C) across the load
D) across the resistance

Question 39

Determine the tolerance and resistance of a resistor labeled 470KJ.

A) 470 kΩ +/- 5%
B) 47 Ω +/- 5%
C) 4700 Ω +/- 5%
D) 47 kΩ +/- 5%

Question 40

Valence electrons of an atom determine the:

A) atomic number
B) electrical stability only
C) chemical and electrical stability
D) chemical stability only

Question 41

What is the resistance value and tolerance with color bands of gray, red, black, and gold?

A) 820 ohms, ± 10%
B) 820 ohms, ± 5%
C) 82 ohms, ± 10%
D) 82 ohms, ± 5%

Question 42

Which of the following is a true statement?

A) Work is the product of voltage V) and charge Q).
B) Voltage is charge Q) divided by energy W).
C) Voltage is not determined by work.
D) Voltage is not determined by charge.

Question 43

Voltage can be produced by means of:

A) chemical energy
B) magnetic energy combined with mechanical motion
C) light energy
D) all of the above

Question 44

Which of the following is a true statement?

A) Collisions do not cause electrons to lose some of their energy.
B) The property of a material to oppose current flow is called work.
C) The more collisions, the more restrictive the flow of electrons.
D) The more collisions, the easier the flow of electrons.

Question 45

Ground is the reference point in electric circuits and has a potential of with respect to other points in the circuit.

A) source voltage
B) an electron
C) 0 volts
D) none of the above

Question 46

Which of the following is NOT a true statement?

A) Lithium-Ion is a primary battery.
B) Batteries are usually classified according to their chemical makeup.
C) A lead-acid battery is a secondary rechargeable) battery.
D) Flat, round batteries are often called button or coin batteries.

Question 47

Transistors used as switches

A) Are often called semiconductor switches.
B) Can open and close a circuit path.
C) Can be controlled by voltage.
D) all of the above
E) none of the above

Question 48

Resistance of the human body averages between:

A) 10K ohms and 50K ohms
B) zero ohms and 100K ohms
C) 50K ohms and 100K ohms
D) 90K ohms and 100K ohms

Question 49

In Bohr's model, the _ _ level is called the ground state and represents the _ atom with a single electron in the first shell.

A) lowest, least stable
B) highest, most stable
C) lowest, most stable
D) lowest, least stable.

Question 50

Which is NOT one of the three categories of materials used in electronics?

A) semiconductors
B) crystals
C) insulators
D) conductors

Question 51

The switch shown is a:

A) SPDT
B) DPDT
C) DPST
D) SPST