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