Chapter 39
The fact that voltage can be created by exerting force on a crystal is used for which type of sensor?
Knock sensor (KS)
Carbon and silicon are examples of ________.
Semiconductors
Which of the following statements is true of conductors?
If the conductor diameter in increased, its resistance is reduced.
An electrical conductor is an element with ________ electrons in its outer orbit.
Less than 4
Two technicians were discussing the characteristics of magnets. Technician A stated that if the same poles of two magnets are brought close to each other, the magnets will snap together. Technician B stated that if the opposite poles of two magnets are brought close to each other, the magnets will push each other apart. Which of the following statements about this scenario is true?
Neither technician A's nor technician B's assessment is accurate.
Two technicians were discussing the characteristics of the valence ring of an atom. Technician A stated that the number of electrons in the valence ring of an atom indicates its capacity to combine with other atoms. Technician B stated that if the valence ring of an atom has three or fewer electrons, it is hard for a drifting electron to push its way into the valence ring. Which of the following statements about this scenario is true?
Only technician A's assessment is accurate.
Two technicians had different views on the formation of ions. Technician A stated that if an atom gains more electrons than protons, it will be positively charged. Technician B stated that an atom becomes an ion when it is unbalanced. Which of the following statements about this scenario is true?
Only technician B's assessment is accurate.
Creating electricity by exerting force on a crystal is called ________.
Piezoelectricity
Like charges ________.
Repel
Which of the following statements is true of electrical measurements?
The volt is the unit of measurement for the amount of electrical pressure.
A potentiometer, a three-wire variable resistor, is used in which type of sensor?
Throttle position (TPS)
The ________ is a unit of electrical pressure.
Volt
If the current flow across the circuit is 2 amperes and the electrical pressure is equal to 10 volts, determine the electrical power of the circuit.
20 watts
Which unit of electricity does the work in the circuit?
Ampere
Which of the following is true of an atom?
An atom has a neutral charge.
Which of the following is true of sources of electricity?
An engine knock sensor (KS) uses the principle of piezoelectricity to create a voltage signal for use as an engine computer input signal.
Technician A says that a two-wire variable resistor is called a rheostat. Technician B says that a three-wire variable resistor is called a potentiometer. Which technician is correct?
Both technicians A and B
Two technicians had different views on electrical pressure. Technician A stated that electrical pressure is a result of excess electrons remaining at one end of the circuit. Technician B stated that it is possible to have electrical pressure without any current flow. Which of the following statements about this scenario is true?
Both technician A's and B's assessments are accurate.
Two technicians were discussing the working principles of different automotive devices. Technician A stated that a starter motor works on the principle that electricity is produced if a conductor is moved through a magnetic field. Technician B stated that an alternator also works on the principle that electricity is produced if a conductor is moved through a magnetic field. Which of the following statements about this scenario is true?
Both technician A's and B's assessments are accurate.
As temperature increases, ________.
The resistance of a conductor increases