Nautical Sciences, Unit Five, Chapter Three: Basic Electricity
This is an Closed Book, Multiple-choice exercise.
Use your mouse to click the box next to the most correct answer. If you fail to select the correct answer you must try again until you select the correct answer.
Which ancient civilization is credited as being the first to study electricity?
The Greeks
The Romans
The Egyptians
The Goths
The Britons
What are ions?
Atoms with an electrical charge.
Negatively charged particles that orbits the nucleus of an atom
Fundamental particles with a positive charge commonly found in the nucleus of atoms.
A nuclear particle with the mass of an electron but opposite charge.
Materials that conduct electrical current easily.
Which of the following is the best definition of the term Conductor?
Materials that permit the free flow of electrons from atom to atom.
An electrically charged atom or group of atoms.
Any material that will not conduct electricity, such as rubber.
The measure of the rate of flow of electrons past a given point in an electric conductor such as a power line.
An electrical device that provides a path for electrical current to flow.
Substances with few free electrons are called what?
Insulators
Conductors
Ions
Magnetrons
Positrons
Voltage, or the electromotive force, is best defined as...
the force that causes electricity to move in a conductor.
the force that is produced by rubbing two materials together.
the force that is produced by squeezing crystals such as natural quartz.
the force that is produced by heating the place where two unlike metals are joined.
the force that is produced when a conductor moves through a magnetic field.
"Static electricity" is the most common name for which method of generating voltage?
Friction
Pressure
Heat
Chemical action
Magnetism
A thermostat relies on which basic method of generating voltage?
Heat
Pressure
Magnetism
Light
Friction
Which of the following is the name of an instrument designed to measure voltage in an electrical circuit?
A voltmeter
An ammeter
A primary cell
An ohmmeter
A thermocouple
Which of the following is an instrument designed to measure current in an electrical circuit?
An ammeter
A voltmeter
An ohmmeter
A secondary cell
A schematic
What is an electrolyte?
Any non-metallic substance that conducts electric current in solution.
An instrument used to measure current in an electrical circuit.
An instrument used to measure resistance in an electrical circuit.
A substance that conducts electric current when light strikes it.
Atoms or groups of atoms that are electrically charged as a result of the loss or gain of electrons.
Electric current that periodically reverses direction is known as what?
Alternating current
Switching current
Insulating current
Direct current
Primary current
In an electrical circuit, good __________ offer very little resistance, while good ________ offer high resistance.
Conductors, Insulators
Insulators, Conductors
Voltmeters, Ammeters
Insulators, Voltmeters
Conductors, Ammeters
What unit of measurement is used to measure the amount of resistance in an electrical circuit?
An ohm
An ampere
A watt
An ammeter
An ohmmeter
An ohmmeter measures what?
The amount of resistance in an electrical circuit.
The amount of current in an electrical circuit.
The amount of voltage in an electrical circuit.
The rate at which work is done within an electrical circuit.
The rate at which alternating current reverses direction.
Two electrodes placed in a container holding electrolyte would be called what?
A simple cell
A primary cell
A secondary cell
A dry cell
A schematic
In which type of battery does the chemical action eat away one of the electrodes?
A primary cell
A secondary cell
A simple cell
A typical automobile storage battery
A thermocouple cell
What is the general direction of electron current flow in a closed circuit?
From negative to positive
From positive to negative
From open to closed
From positive to positive
From negative to negative
A diagram in which symbols are used to show an electrical circuit's components is called a(n) __________.
Schematic
Thermocouple
Ammeter
Resistor
Flow diagram
Which of the following defines "Ohm's Law"?
The current in a circuit is directly proportional to the applied voltage and inversely proportional to the circuit resistance.
The current in a circuit is directly proportional to the circuit resistance and inversely proportional to the applied voltage.
The current in a circuit is directly proportional to the applied voltage and directly proportional to the circuit resistance.
The current in a circuit is inversely proportional to the applied voltage and inversely proportional to the circuit resistance.
The voltage in a circuit is directly proportional to the applied current and inversely proportional to the circuit resistance.
You have an electrical circuit with 3 ohms of resistance and a source voltage of 3 volts. How much current flows in this circuit?
1 ampere
9 amperes
1/3 amperes
6 amperes
2 amperes
You have an electrical circuit with 3 ohms of resistance and a current of 6 amperes. How much voltage is in this circuit?
18 volts
12 volts
1.5 volts
6 volts
3 volts
You have an electrical circuit with 30 volts and a current of 6 amperes. How much resistance is in this circuit?
5 ohms
.2 ohms
180 ohms
15 ohms
.5 ohms
What takes place every time a force causes motion?