AUT109 - Chapter 50
In a circuit, you know the resistance is 100 ohms and the current draw is 0. What would the voltage drop be?
0 volts
Ohm's law will show how many amps will flow through a circuit with 110 ohm resistor and a 12-volt power supply. Using the Ohm's law formula, how many amps will flow through this circuit?
0.12 amps
A pulse width of 25% means that the electrical power is on ____ of the time.
0.25
Ohm's law tells us that it takes 1 volt to push 1 amp through how many ohms?
1 ohm
To solve for amps, use the following formula:
A = V ÷ R
What is an open circuit?
A break in the wire
________, or current flow, can be thought of as a faucet being turned on and water flowing.
Amperage
The _____ is the unit used to describe how much current or how many electrons are flowing at a given point in a given amount of time when work is being performed for example, when a lamp is operating.
Ampere
Tech A states that a common and easily observable source of electricity is the static electricity produced in thunderstorms. Tech B states that electricity can be produced by the movement of a conductor through a magnetic field. Who is correct?
Both A and B
_____ is achieved when an electrical circuit has a continuous and uninterrupted electrical connection and is thereby capable of conducting current and working as designed.
Continuity
With equal numbers of protons and ________, the charges within an atom cancel each other out, leaving the atom with no overall charge.
Electrons
Electricity is not governed by the laws of physics.
False
Hertz is the measurement of frequency and indicates the number of cycles per minute.
False
When a person's legs turn the pedals of a bicycle, mechanical energy (from oxygen and food) is being turned into chemical energy.
False
Electricity is the______ .
Flow of electrons
What is one by-product of electricity flow?
Heat
A faulty circuit may have_______.
High resistance and no continuity
Photo-voltaic cells generate electricity from:
Light
Which of the following is an effect of the flow of electricity?
Light, magnetism, and heat
Tech A states that the nucleus has at least one negatively charged electron. Tech B states that moving around the nucleus are one or more positively charged protons. Who is correct?
Neither A nor B
A disconnected battery is _____, and is _____.
Not doing work; still a source of energy
The ______ is the unit used to describe the amount of electrical resistance in a circuit or component.
Ohm
In an electrical circuit, "_____" refers to the rate at which electrical energy is transformed into another kind of energy.
Power
On automobile ignition systems, the coil is responsible for creating the spark required to ignite the air/fuel mixture. The ignition coil is a step-up transformer, and contains two sets of internal windings referred to as a ___________ winding and the _____________ winding.
Primary; secondary
In calculating Ohm's law, _____.
R stands for "resistance," V stands for "voltage," and A stands for "current"
Tech A says an atom with more electrons than protons has an overall positive charge. Tech B says not all atoms can give up or accept electrons easily. Who is correct?
Tech B
Two technicians are discussing a pair of light bulbs in series. Technician A states that if one of the bulbs burns out, the other will remain lit. Technician B states that if one bulb burns out, neither light will be lit. Which technician is correct?
Technician B
Under most conditions, except ________ change, the resistance of an object is a constant and does not depend on the amount of the voltage or the amount of current passing through it.
Temperature
The amount of induction is dependent upon all of the following EXCEPT ____.
The number of magnets used
Atoms with fewer electrons in the valence ring are the best conductors, with one electron being the best conductive material.
True
Freed electrons can be made to flow in a circuit, where they are used to perform work.
True
If a length of magnet wire is wound into a coil, the magnetic fields combine to create a stronger and denser magnetic field, with a north and a south pole, just like a permanent magnet.
True
Many vehicles connect the chassis and body to the negative battery terminal, which means most of the metal components on the vehicle are grounded.
True
Regardless of the way it is produced, electricity is always the movement of protons in a conducting circuit.
True
Series-parallel circuits can be analyzed using the same electrical laws that apply to separate series or parallel circuits; you just have to apply the series laws to the series portion and the parallel laws to the parallel portion.
True
The higher the resistance, the less current (amps) that will flow in the circuit for any particular voltage.
True
The low-resistance fault causes abnormally high current flow in the circuit and may cause the circuit protection devices, such as fuses or circuit breakers, to open the circuit.
True
The power equation is: P, the power in watts, equals V, the voltage in volts, multiplied by A, the current in amps.
True
This process of converting light (photons) to electricity (voltage, which moves electrons) is called the photovoltaic (PV) effect.
True
Voltage can vary across different points in a circuit, but determining the current at any point can be done without an ammeter by using Ohm's law.
True
If two different metals are joined and heated, a small electrical current can be generated. The point that is heated is called a ___________.
hot junction
Alternating current:
moves back and forth
Static electricity is created by:
rubbing two insulators together
Complete engine removal and disassembly is usually performed when:
the engine requires major repairs or rebuilding
Electrochemical energy is produced when:
two dissimilar metals are submerged in an electrolyte solution
