Chapters 17, 18, 19
One milliamp is equal to:
0.001 amp
10,000 ohms can also be written as:
10 kilohms
A 12-volt circuit has a resistance of 2 ohms. How much current is in the circuit?
6 amps
Technician A says a diode is commonly used to convert alternating current into direct current. Technician B says one diode in series with an ac source produces full-wave rectification. Who is right?
A only
Technician A says a series circuit has only one path for current. Technician B says a series circuit can have only one load. Who is right?
A only
Technician A says that a replacement fuse must have the same amp rating as the original. Technician B says a 20-amp automotive fuse will handle 25 amps of current without blowing. Who is right?
A only.
Technician A says that an electrical short circuit causes excess current flow. Technician B says a short causes excess resistance to develop. Who is right?
A only.
Match the following identifying phrase with the correct term: Unit of current flow
Amp
Technician A says a rheostat has at least three electrical connections. Technician B says a potentiometer has at least three electrical connections. Who is right?
B only
Technician A says a transistor is a device used to rectify current in a circuit. Technician B says a transistor is a device used to amplify current in a circuit. Who is right?
B only
Technician A says electrons and protons form the nucleus of an atom. Technician B says electrons have a negative charge. Who is right?
B only
Technician A says a change in circuit resistance will change the amount of current in the circuit. Technician B says a change in circuit voltage will change the amount of current in the circuit. Who is right?
Both A and B
Technician A says a load is a basic component of an electric circuit. Technician B says a power supply is a basic component of an electric circuit. Who is right?
Both A and B
Technician A says a mercury switch can be used to activate the underhood light in a vehicle. Technician B says a pressure switch can be used in the engine oil light circuit. Who is right?
Both A and B
Technician A says a semiconductor can act like an insulator. Technician B says a semiconductor can be used as a conductor. Who is right?
Both A and B
Technician A says a transformer can be used to isolate a circuit. Technician B says a transformer can be used to change the voltage in a circuit. Who is right?
Both A and B
Technician A says an insulator is a substance that resists the flow of electricity. Technician B says the atoms in an insulator are very stable and resist electron movement. Who is right?
Both A and B
Technician A says electricity is the movement of free atoms from one place to another. Technician B says electricity is the movement of free elements from one place to another. Who is right?
Both A and B
Technician A says that as voltage increases and resistance remains constant, current increases. Technician B says that as voltage decreases and resistance remains constant, the number of free electrons flowing through a circuit decreases. Who is right?
Both A and B
Select the correct component described by the following identifying phrase: Storage device for electricity.
Capacitor
Select the correct component described by the following identifying phrase: Insulated wire wrapped around iron core.
Coil
Match the following identifying phrase with the correct term: The flow of electrons in a circuit
Current
Select the correct component described by the following identifying phrase: Passes current in only one direction.
Diode
Which of the following is the Ohm's Law formula for finding current?
I = E ¸ R
Match the following identifying phrase with the correct term: Device that uses electrical energy
Load
Technician A says the electron flow theory states that electrons flow through a circuit from positive to to negative. Technician B says the conventional current theory states that electrons flow through a circuit from negative to positive. Who is right?
Neither A nor B
Match the following identifying phrase with the correct term: Unit of resistance
Ohm
Select the correct component described by the following identifying phrase: Limits current flow in a circuit.
Resistor
Select the correct component described by the following identifying phrase: Switch or amplify current in a circuit.
Transistor
True or False: A circuit breaker's amp rating specifies the highest current that the breaker can tolerate without tripping.
True
True or False: A device that uses electrical energy is called a conductor.
True
True or False: A relay uses a small input current to control a larger circuit current.
True
True or False: Diodes are commonly used to convert direct current to alternating current.
True
True or False: In a parallel circuit, total current is the sum of all branch currents.
True
True or False: Most automotive electrical problems are caused by a change in circuit resistance.
True
True or False: The voltage and current in a transformer are inversely proportional.
True
True or False: Unlike charges attract each other, and like charges repel each other.
True
True or False: When a diode is forward-biased, it acts as a conductor.
True
True or False: When electrical current passes through a wire, a magnetic field is generated.
True
Match the following identifying phrase with the correct term: Unit of electrical pressure
Volt
What type of diode is a special type of diode that serves as a voltage regulator?
Zener
The size of a capacitor is rated in ______.
farads
All of the following are photonic devices except:
field-effect transistors
A ______ has a set Ohms value that does not change.
fixed resistor
To protect an electrical circuit from damage by a "short," a device called a ____ is installed.
fuse
An atomic force that can attract or repel ferrous substances is known as:
magnetism
The resistance of a circuit is measured in ____.
ohms
A ______ device produces a low current output when physical pressure is applied.
piezoelectric crystal
A bipolar junction transistor (BJT) is made by joining _____ semiconductor materials.
three
The electrical pressure that causes current is known as:
voltage
