Electrical Unit: Ultimate Practice Exam! Quiz

There are some situations where there is a single wire, but most networks operate on a two wire system, and the data is transmitted at two different speeds.

Voltage, amperage, and resistance are the 3 main electrical measurements.

The voltage regulator monitors voltage and makes adjustments based upon demand and use of the vehicle's electrical system.

All of the above are correct.

A DVOM is a digital volt-ohmmeter and is has that name because of what it tests and how it displays the measurement.

Solve volts = amps x resistance.

Lead plates and acid are the two main parts of a car battery.

Solve for ohms law. V=IR

You always wear safety glasses when working in the shop, on anything.

The power supply is one of the components of a simple circuit. The switch interrupts the current in a circuit.

Solenoids are used in many automotive applications, injectors and starter motors are 2 of these uses.

A switch controls the current flow to the resistor.

Are of the listed are important for a modern automobile.

Software updates, transfers, and reprogramming may all need to be performed when diagnosing or replacing a vehicle's control module.

Data on a CAN transmits at a high speed.

The data in a CAN is at a very high speed with respect to other data transfer in a vehicle.

Only the flooded cell battery has removable covers to check the internal water level.

Ohm's law is V=IR, no matter how you arrange it. You can use Ohm's law to determine the total drop of voltage.

Solve volts = amps x resistance.

Yes, the scope is commonly referred to as either of the three listed, and are very important instruments in testing and inspecting faults with modern automobiles.

If you're doing a voltage drop, you need the circuit to be live. Disconnecting the battery cable will open the circuit.

You can check a circuit for resistance, voltage, and current. If you have two of the measurements, you will be solving for a single variable.

Wire size is very important. That is why the starter cables are the size they are. There are many gauges of wire size.

Car batteries have lead and should always be recycled.

The starter takes the battery's charge and converts it into movement, or mechanical energy.

A series circuit is when the resistances are sequentially in line with each other.

Solve for ohms law. V=IR

The diode only allows current to flow one way through the circuit.

A small amount of current is used to energize the windings in a relay. They can either be normally open or closed.

The reaction between the acid and the lead is what creates the movement of electrons.

Alternators create AC voltage and need to be rectified to DC to be used in automobiles. You can not run an AC motor on DC volts, and vise versa.

You need current flow to measure a drop in voltage, and can be done across any kind of circuit or load.

DVOMs have both a manual and auto setting. OL does mean you are measuring more than the maximum setting set on the meter.

Grounding is the act of completing the circuit to the negative part of the battery. Since the battery ground hooks up to the chassis, it can be used as a universal ground for the vehicle.

The alternator rectifies the AC voltage into DC voltage.

Copper has a low resistance. That is why it is used to carry electricity. Both the length and width of a wire will effect the amount of resistance it has.

A resistor is a resistor. There are only small differences between them. There is only one kind of DVOM.

The sum of the resistances in a parallel circuit equals the total current flow in the circuit.

CANs can be checked with either a digital multimeter or an osciliscope.

Never reseal a hole after probing with silicone.

The voltage drop test measures the difference in voltage across a circuit. In this case, the reading is 2.7 volts. Since the total voltage in the circuit is 12 volts, subtracting the voltage drop from the total voltage gives us the voltage going to the load. Therefore, the voltage going to the load is 9.3 volts.

A circuit does not need to be live to test for resistance. Having the component will keep from any feedback testing from happening.

Think of a fuel level sensor, also known as a sending unit.

A relay has two sides. The control side has a winding that gets charged and closes the switch on the other side of the relay. To read amperage in a circuit, you either need an amp clamp or to hook up the DVOM in series with the circuit.

Parallel circuits are when the resistances are side by side, with individual power supplies and grounds. The sum of all of the current draws in a parallel circuit is the total current draw in the circuit.

The constant jarring of the battery internals will cause the lead plates to shatter. Anything other than an acceptable battery hold down is insufficient.

Each healthy cell in a car's battery should have 2.1 volts. 6 cells multiplied by 2.1 equals 12.6 volts.

DVOM needs to be set to test volts, and yes, you need a live circuit to test the voltage drop.

Resistors or loads eat up the energy from the source. A voltmeter is used to measure the drop of voltage through a circuit.

The charge of electrons and protons in an atom cancel each other. Some atoms are already "happy", others want to accept electrons, and others what to give up theirs to have 8 valence electrons.