Question 1

Protons are attracted to other protons and repel electrons.

Accepted Answer

Protons repel other protons due to their positive charge and are attracted to electrons, which have a negative charge.

Question 2

An atom must always have an equal number of protons and electrons.

Accepted Answer

Atoms can become ions by gaining or losing electrons, resulting in an unequal number of protons and electrons.

Question 3

Copper is a good conductor of electric current because it has eight or more electrons in its valence band.

Accepted Answer

Copper is a good conductor of electric current because it has only one electron in its valence band, which allows it to move freely and conduct electricity efficiently.

Question 4

Increasing the voltage causes the electric current flowing through a fixed value of resistance to increase.

Accepted Answer

According to Ohm's Law, the current (I) through a resistor is directly proportional to the voltage (V) across it, given by the formula I = V/R, where R is the resistance. Therefore, increasing the voltage increases the current if the resistance remains constant.

Question 5

Increasing the resistance while keeping the voltage source held at a fixed value causes the electric current flowing through the resistance to decrease.

Accepted Answer

According to Ohm's Law (V = IR), if the voltage (V) is constant and the resistance (R) increases, the current (I) must decrease to maintain the equation's balance.

Question 6

Voltage is most like which of the following:
A) Restriction
B) Pressure
C) Flow rate
D) Temperature

Accepted Answer

Voltage is analogous to pressure in a fluid system. Just as pressure drives the flow of fluid, voltage drives the flow of electric charge.

Question 7

Technician A says that an ohmmeter can be used to measure voltage drop. Technician B says that an ammeter can be used to measure current. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

An ammeter is used to measure current, while an ohmmeter is used to measure resistance, not voltage drop.

Question 8

Which is most like electric current?
A) Restriction
B) Pressure
C) Flow rate
D) Temperature

Accepted Answer

Electric current is most like flow rate because it represents the flow of electric charge through a conductor, similar to how flow rate measures the movement of fluid through a pipe.

Question 9

Technician A says that the conventional theory describes electric current flow from negative to positive. Technician B says that current is measured in units of amperes per second. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

The conventional theory describes electric current flow from positive to negative, not negative to positive. Current is measured in amperes, not amperes per second.

Question 10

Which is the correct equation for Ohm's law?
A) Voltage/Resistance = Current
B) Current × Resistance = Voltage
C) Voltage/Current = Resistance
D) All of the above are valid expressions of Ohm's law.

Accepted Answer

Ohm's law states that Voltage (V) = Current (I) × Resistance (R). All the given expressions are rearrangements of this equation and are valid.

Question 11

Which of the following is the largest value of pressure measured at sea level?
A) 14.7 psi absolute (101 kPa absolute)
B) 14.7 psi gauge (101 kPa gauge)
C) -14.7 psi absolute (-101 kPa absolute)
D) All of the above are the same value of pressure.

Accepted Answer

The answer of Which of the following is the largest...

Question 12

A voltmeter that is being used to measure a voltage drop across a resistor is most like which of the following?
A) A differential pressure gauge measuring the pressure drop across a hydraulic circuit restriction
B) A flow meter measuring the rate of hydraulic fluid flow
C) Two pressure gauges measuring the pressure in a hydraulic circuit referenced to atmospheric pressure
D) An ohmmeter measuring the resistance in an electric circuit with current flowing through the circuit

Accepted Answer

A voltmeter measures the difference in electric potential between two points, similar to how a differential pressure gauge measures the pressure difference across a restriction.

Question 13

Referring to the following circuit, technician A says that 12V would be dropped across R1 and R2. Technician B says that the same amount of current will flow through R1 and R2. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Referring to the following circuit, technician A...

Question 14

Which of the following is a true statement regarding the circuit shown below?

A) The amount of current flow through R1 is equal to the current flow through R2 added to the current flow through R3.
B) The voltage dropped across R2 is the same as the voltage dropped across R3.
C) The voltage dropped across R2 added to the voltage dropped across R1 is equal to 12V.
D) All of the above are true statements.

Accepted Answer

The answer of Which of the following is a true...

Question 15

What is the total resistance of the circuit shown below?

A) 11 ohms
B) 21 ohms
C) 6 ohms
D) 12V x the total current

Accepted Answer

The answer of What is the total resistance of the...

Question 16

Which is a correct statement with regard to the circuit shown below?

A) Electricity always takes the path of least resistance; therefore no current will flow through R1.
B) The same amount of electric current will flow through R1 and R2.
C) If R2 were removed from the circuit, the amount of current flow through R1 would remain unchanged.
D) The voltage dropped across R2 is much less than the voltage dropped across R1.

Accepted Answer

The answer of Which is a correct statement with regard...

Question 17

Referring to the following circuit, which resistor has the highest voltage dropped across it?

A) R1
B) R2
C) Both R1 and R2 have the same voltage drop.
D) Neither resistor will have a voltage drop since no current will flow in this circuit.

Accepted Answer

The answer of Referring to the following circuit, which resistor...

Question 18

Which best describes the reason that a circuit breaker or fuse may interrupt electric current if someone is using too many household devices at the same time such as a hair dryer, microwave oven, and toaster?
A) The devices are all connected in series and each device that is switched on adds an additional series resistance.
B) The devices are all connected in parallel and each device that is switched on decreases the total circuit resistance causing the total circuit current to increase.
C) The circuit breaker or fuse has too small of a rating.
D) The electric company limits the amount of current supplied to a house.

Accepted Answer

When devices are connected in parallel, turning on more devices decreases the total resistance and increases the total current, which can exceed the circuit breaker's or fuse's rating, causing it to interrupt the current.

Question 19

A technician measures 10A using a clamp-on inductive ammeter placed around the battery positive cable on a truck with the ignition on and engine off. He also measures 10A with the inductive ammeter placed around the battery negative cable. Which best explains the reason for these measurements?
A) Kirchhoff's voltage law
B) Ohm's law
C) Kirchhoff's current law
D) The rules of series-parallel circuits

Accepted Answer

Kirchhoff's current law states that the total current entering a junction must equal the total current leaving the junction. In this case, the current measured on the positive cable is equal to the current on the negative cable, as the current flowing into the battery is the same as the current flowing out.

Question 20

Which of the following is the largest value of resistance?
A) The total resistance of two 1k ohm resistors connected in series
B) The total resistance of two 1k ohm resistors connected in parallel
C) 1000 ohms
D) 100,000 milliohms

Accepted Answer

When two 1k ohm resistors are connected in series, their resistances add up, resulting in a total resistance of 2000 ohms, which is the largest value among the options.

Quiz 2: The Fundamentals of Electricity

Protons are attracted to other protons and repel electrons.

An atom must always have an equal number of protons and electrons.

Copper is a good conductor of electric current because it has eight or more electrons in its valence band.

Increasing the voltage causes the electric current flowing through a fixed value of resistance to increase.

Increasing the resistance while keeping the voltage source held at a fixed value causes the electric current flowing through the resistance to decrease.

Voltage is most like which of the following:

Technician A says that an ohmmeter can be used to measure voltage drop. Technician B says that an ammeter can be used to measure current. Who is correct?

Which is most like electric current?

Technician A says that the conventional theory describes electric current flow from negative to positive. Technician B says that current is measured in units of amperes per second. Who is correct?

Which is the correct equation for Ohm's law?

Which of the following is the largest value of pressure measured at sea level?

A voltmeter that is being used to measure a voltage drop across a resistor is most like which of the following?

Referring to the following circuit, technician A says that 12V would be dropped across R1 and R2. Technician B says that the same amount of current will flow through R1 and R2. Who is correct?

Which of the following is a true statement regarding the circuit shown below?

What is the total resistance of the circuit shown below?

Which is a correct statement with regard to the circuit shown below?

Referring to the following circuit, which resistor has the highest voltage dropped across it?

Which best describes the reason that a circuit breaker or fuse may interrupt electric current if someone is using too many household devices at the same time such as a hair dryer, microwave oven, and toaster?

A technician measures 10A using a clamp-on inductive ammeter placed around the battery positive cable on a truck with the ignition on and engine off. He also measures 10A with the inductive ammeter placed around the battery negative cable. Which best explains the reason for these measurements?

Which of the following is the largest value of resistance?