M03 Chapter 3 Electricity and Electronic Fundamentals AUTI 142
How much resistance is in a 12 volt circuit that is drawing 4 amperes? Group of answer choices .333 ohms 3 ohms 4.8 ohms 48 ohms
3 ohms
During heavy acceleration a vehicle has sluggish performance when the air conditioning is on. Which of the following is the most likely cause? Group of answer choices A restricted cabin air filter. A faulty engine load sensor cut-off system. A faulty condenser cooling fan. A slipping A/C compressor clutch.
A faulty engine load sensor cut-off system.
A relay is an electromagnetic switch that allows a small amount of current to control: Group of answer choices A large voltage A large current A small voltage A large resistance
A large current
Technician A says on some vehicles the pressure cycling switch directly opens and closes the electrical circuit to the compressor clutch coil. Technician B says on some vehicles the pressure cycling switch sends a signal to the microprocessor to turn the compressor on and off. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Both A and B
A jumper wire is used to bypass a load. Group of answer choices True False
False
Circuit protectors are usually found on the negative side of the circuit. Group of answer choices True False
False
The amount of resistance in a circuit may be measured using an ammeter. Group of answer choices True False
False
To find the resistance of a circuit, divide the amperage by the voltage (I/R). Group of answer choices True False
False
Resistance is defined as the opposition to current flow and is measured in: Group of answer choices Volts Resistance Ampere's Ohm's
Ohm's
Technician A says a fuse should only be replaced with the same ampere rating as the original designed for the circuit. Technician B says circuit breakers can be replaced with one of a slightly lower ampere rating if the original size designed for the circuit is not available. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Technician A only
An air conditioning system has no blower speeds. When the blower motor power side wire is connected to a 12-volt power source, it begins to operate. Technician A says this means the blower motor is defective. Technician B says this means the problem could be in the control system. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Technician B only
In a parallel circuit: Group of answer choices Total circuit resistance is less than the lowest resistance. Amperage will decrease as more branches are added. Total resistance is the sum of all of the resistances in the circuit. All of the above.
Total circuit resistance is less than the lowest resistance.
A 10% duty cycle indicates that the load is turned on 1/10th of the time. Group of answer choices True False
True
The total amperage in a parallel circuit will be the sum of the individual branches. Group of answer choices True False
True
In a parallel circuit, there is more than one path for electricity to follow. Group of answer choices True False
True
Voltage is defined as electrical pressure and is measured in: Group of answer choices Volts Resistance Ampere's Ohm's
Volts
According to Ohm's Law, what is the resistance when 1 volt pushes 1 ampere of current through a conductor? Group of answer choices 0 ohm 1 ohm 1 watt 1 coulomb
1 ohm
If a poor electrical connection is suspected which is the most effective test to perform? Group of answer choices Resistance measurement at the suspected connector Amperage draw test of circuit A voltage drop test at the suspected connector Check Source voltage at the suspected connector
A voltage drop test at the suspected connector
In a series circuit: Group of answer choices Total circuit resistance is the sum of the individual circuit resistances. The sum of the individual voltage drops equals the source voltage. Current flow is the same at any point in the circuit. All of the above
All of the above
A blower motor placed in high speed mode has low airflow. A voltmeter placed across the motor reads 4 volts. Technician A says there may be excessive resistance in the ground circuit. Technician B says there may be excessive resistance in the power circuit. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Both A and B
Blower motor speed control is being discussed: Technician A says that blower motor speed control is automatic in an automatic temperature-controlled system. Technician B says that blower motor speed may be manually selected in an automatic temperature-controlled system. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Both A and B
Technician A says testing with a voltmeter can determine the voltage drop across the blower motor. Technician B says testing with a voltmeter can determine if unwanted resistance is present in the circuit. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Both A and B
Diagnosis of a possible faulty air-conditioning switch is being discussed. Technician A says to use an ohmmeter with the switch isolated to test continuity through the switch. Technician B says to use a jumper wire to bypass the switch in order to operate the air conditioning relay controlled by the switch. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Both A and B
Technician A says the total amperage in a parallel circuit is equal to the sum of the individual branch circuits. Technician B says the amperage in a series circuit is the same anywhere in the circuit. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Both A and B
Technician A says a four-speed blower motor control has a five-position switch. Technician B says all blower motors have several windings in the motor to provide speed control. Who is correct? Group of answer choices Technician A only Technician B only Both A and B Neither A nor B
Technician A only
All of the following are common circuit faults except: Group of answer choices Short to ground Open in circuits Voltage drop test High resistance
Voltage drop test
What is voltage drop? Group of answer choices Voltage used up when pushing current through a resistance Current used to go through a resistance Electrons used to go through a resistance All of the above
Voltage used up when pushing current through a resistance