AUT 125 Test 1

Unlike magnetic poles ____________ and like magnetic poles _______________.

Attract and repel

If a 12-volt battery is connected to a series circuit with three resistors of 2 ohms, 4 ohms, and 6 ohms, how much current will flow through the circuit?

1 AMP

How many watts are consumed by a starter motor if it draws 150 amperes at 10 volts?

1,500 Watts

If the resistance and the voltage are known, what is the formula for finding the current (amperes)?

I = E/R

Carbon and silicon are examples of ________.

Semiconductors

If 12 volts are being applied to a resistance of 3 ohms, _______ amperes will flow.

4

The fact that a voltage can be created by exerting force on a crystal is used in which type of sensor?

Knock Sensor

An electrical conductor is an element with __________ electrons in its outer orbit.

Less than 4

Creating electricity by exerting a force on a crystal is called _______________.

Piezoelectricity

Like charges______?

Repel

If an insulated wire rubbed through a part of the insulation and the wire conductor touched the steel body of a vehicle, the type of failure would be called a(n) ________.

Short to ground

Which circuit failure is most likely to cause the fuse to blow?

Short to ground

If two insulated wires were to melt together where the copper conductors touched each other, the type of failure would be called a(n) ___________.

Short to voltage

The sum of the voltage drops in a series circuit equals the _______________.

Source Voltage

An ignition coil is an example of a _______________.

Step Up transformer

A series circuit has three resistors of 4 ohms each. The voltage drop across each resistor is 4 volts. Technician A says that the source voltage is 12 volts. Technician B says that the total resistance is 18 ohms. Which technician is correct?

Tech A

A series circuit has two 10-ohm bulbs. A third bulb is added in series. Technician A says that the three bulbs will be dimmer than when only two bulbs were in the circuit. Technician B says that the current in the circuit will increase. Which technician is correct?

Tech A

The __________ is a unit of electrical pressure

Volt

The conventional theory for current flow is being used to determine the direction of magnetic lines of force. Technician A says that the left-hand rule should be used. Technician B says that the right-hand rule should be used. Which technician is correct?

tech B only

A potentiometer, a three-wire variable resistance, is used in which type of sensor?

throttle Position

How many watts are consumed by a light bulb if 1.2 amperes are measured when 12 volts are applied?

14.4 watts

Calculate the total resistance and current in a parallel circuit with three resistors of 4 Ω, 8 Ω, and 16 Ω, using any one of the five methods (calculator suggested). What is the total resistance and current?

2.3 ohms (5.3 amperes)

If 200 amperes flow from the positive terminal of a battery and operate the starter motor, how many amperes will flow back to the negative terminal of the battery?

200 amperes

Which unit of electricity does the work in a circuit?

Ampere

Magnetic field strength is measured in _________.

Ampere turns

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 Tech A and B

Technician A says that a relay is an electromagnetic switch. Technician B says that a solenoid uses a movable core. Which technician is correct?

Both tech A and B

Technician A says that magnetic lines of force can be seen by placing iron filings on a piece of paper and then holding them over a magnet. Technician B says that the effects of magnetic lines of force can be seen using a compass. Which technician is correct?

Both tech A and B

Technician A says that the sum of the voltage drops in a series circuit should equal the source voltage. Technician B says that the current (amperes) varies depending on the value of the resistance in a series circuit. Which technician is correct?

Both tech A and B

Two technicians are discussing electromagnetic induction. Technician A says that the induced voltage can be increased if the speed is increased between the conductor and the magnetic lines of force. Technician B says that the induced voltage can be increased by increasing the strength of the magnetic field. Which technician is correct?

Both tech A and B

Two technicians are discussing ignition coils. Technician A says that some ignition coils have the primary and secondary windings electrically connected. Technician B says that some coils have totally separate primary and secondary windings that are not electrically connected. Which technician is correct?

Both tech A and B

Electromagnetic interference can be reduced by using a _____________.

Coil, Capacitor, and Resistance

High resistance in an electrical circuit can cause ___________________.

Dim lights, Slow Motor operation, Clicking or relays or solenoids

What is the symbol for voltage used in calculations?

E

An ignition coil operates using the principle(s) of __________________.

Electromagnetic induction, Self-Induction, and Mutual Induction

A vehicle has four parking lights all connected in parallel and one of the bulbs burns out. Technician A says that this could cause the parking light circuit fuse to blow (open). Technician B says that it would decrease the current in the circuit. Which technician is correct?

Tech B

Two bulbs are connected in parallel to a 12-volt battery. One bulb has a resistance of 6 ohms and the other bulb has a resistance of 2 ohms. Technician A says that only the 2-ohm bulb will light because all of the current will flow through the path with the least resistance and no current will flow through the 6-ohm bulb. Technician B says that the 6-ohm bulb will be dimmer than the 2-ohm bulb. Which technician is correct?

Tech B

As temperature increases ________.

The resistance of a conductor increases

The amperage in a series circuit is ________________.

The same anywhere in the circuit

If the voltage increases in a circuit, what happens to the current (amperes) if the resistance remains the same?

increases