Basic Auto Electricity Final

To find the resistance of a circuit, divide the amperage by the voltage (I/V).

False

In a parallel circuit, there is more than one path for electricity to follow.

True

Voltmeter test leads are placed in parallel with the circuit.

True

A closed circuit is a completed path for the flow of electricity starting from a source and returning to the source.

True

The total resistance of all the parallel loads is always more than the smallest individual resistance.

False

The frame of the vehicle is normally attached to the positive battery post.

False

The total amperage in a parallel circuit will be the sum of the individual circuits.

True

In a series circuit, total resistance will always be lower than any one resistance value.

False

Corrosion is not a contributor to voltage drop.

False

Voltage will exist between any two points in a circuit unless the potential drops to zero.

True

According to Ohm's Law, what is the resistance when 1 volt pushes 1 ampere of current through a conductor?

1 ohm

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?

Both Tech A and Tech B

What does the sum of the voltage drops in a series circuit equal?

The source voltage

What is the formula for Ohm's Law (in which E = volts, I = amperes, and R = resistance)?

E=IxR

What will adding resistance to a series circuit cause?

Less current to flow

What is voltage drop?

Voltage used up when pushing current through a resistance

In a series circuit which of the following statements is correct?

The total resistance is the sum of all the resistances in the circuit

All of the following statements about voltage drops are true except:

a. Voltage drop can be measured with a voltmeter.

b. Voltage drop is the conversion of electrical energy into another form energy form.

c. All of the voltage from the source must be dropped before it returns to the source.

d. Corrosion is not a contributor to voltage drop.

d. Corrosion is not a contributor to voltage drop.

What is the amperage flowing through a 36 watt bulb in a 12 volt circuit?

3 amps

Technician A says when a magnetic field is moved across a conductor, voltage will be induced in the conductor. Technician B says when a conductor is moved across a magnetic field, voltage will be induced in the conductor. Who is correct?

Both Tech A and Tech B

Technician A says an atom that loses or gains one electron is balanced. Technician B says an atom that loses or gains one electron is called a charged particle or ion. Who is correct?

Tech B only

Technician A says testing with a voltmeter can determine the voltage drop across the headlights. Technician B says a voltmeter can determine if excessive resistance is in the circuit. Who is correct?

Both Tech A and Tech B

In a closed circuit with a capacitor, when will the current stop flowing?

When the voltage charge across the capacitor plates becomes equal to the source voltage

Technician A says amperage is the same at any point in a series circuit. Technician B says the total resistance is the sum of all resistance in a series circuit. Who is correct?

Both Tech A and Tech B

Technician A says the conventional theory of current flow states that current flows positive to negative. Technician B says current flows randomly. Who is correct?

Tech A only

Three 10-ohm resistors are wired in parallel. What is the total resistance?

3.3 ohms

A taillight bulb is glowing dimly. A voltmeter placed across the bulb 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 feed circuit. Who is correct?

Both Tech A and Tech B

Technician A says voltage will not exist between any two points in a circuit if the potential is zero. Technician B says corrosion is NOT a contributing factor to voltage drop. Who is correct?

Tech A only

Technician A says power is found by multiplying voltage times current. Technician B says power is expressed as wattage. Who is correct?

Both Tech A and Tech B