Flashcards in Abeka Science Chapter 13 Deck (41):
What is the study of nature, behavior, and uses of static electricity and related phenomena?
What Greek philosopher, mathematician, and astronomer observed that a piece of amber, when rubbed with wool, attracts straw?
Thales of Miletus
What 18th century scientist discovered that static electricity exists in two forms- positive and negative?
What property allows protons and electrons to attract and repel other charged particles by the electromagnetic force?
What is the interactions between electrons and other charged particles?
What is the simplest form of electricity?
True or False: Equal and opposite charges neutralize each other when they come into contact.
What is the region around a charged object in which other objects are attracted or repelled by an electric force?
An electric field
What are the imaginary lines that indicate the direction and strength of the field called?
Lines of force
What is the SI unit of electric charge?
What the law states that opposite charges attract each other, but like charges repel each other?
The law of electric charges
What does a uniform field mean?
The strength of the field is equal throughout.
What scientist, after whom the SI unit of charge is named, established certain behaviors of static electricity which are recorded in the law of electric force?
Charles de Coulomb
What law states that the strength of the attraction or reulsion between two charged ojects is directly related to the strength of the charges and inversely related to the square of the distance between them?
The law of electric force
What is it called when electric charge is transferred by direct contact?
True or False:
A charge imparted by conduction has the opposite sign (positive or negative) than the original sign.
The charge has the same sign
Is charging by conduction permanent?
What law describes another property of charging by conduction? It states that the total charge is the same before and after an interaction.
The law of conservation of charge
What is the process of diverting unwanted electric charge directly into the earth called?
How can electric charge be imparted at a distance without the objects touching?
How many charges does induction produce?
What is the similarity between charging by induction and charging by convection?
They both obey the law of conservation of charge.
Is charging by induction usually permanent?
No, it's normally temporary.
How can a permanent charge be produced by induction?
If induction and grounding are combined, a permanent charge can be produced.
What is the flow of charge from one place to another?
What solutions readily conduct electricity?
What is a simple device that uses the laws of electrostatics to detect small electric charges?
What did William Gilbert call his electroscope?
Who built the first electrostatic generator?
Otto van Guericke
What device produces static electricity?
An electrostatic generator
What machine, built by James Wimshurst, used two rotating disks to increase a charge through induction?
The Wimshurst machine
What electrostatic generator is the most common in use today? It was invented by Robert J. Van De Graaf.
The Van de Graaf machine
Where does the electric charge move on an object?
The electric charge always moves to the oustide of an object.
What is the initial stream of electrons called that moves from the cloud to the ground?
A stepped leader
What is it called when the positive charge on the ground launches upward to met a stepped leader?
A positive streamer
What is the upward flow of positive charge that results from the meeting of the positive streamer and stepped leader?
The return stroke
After the flash of light occurs from the return stroke, what can occur if enough charge is available?
A dart leader
What device did Franklin invent that protects buildings and other structures from lightning strikes?
What device did Musschenbroek invent that could collect an electric charge and store it?
The Leyden Jar
What is a device used to store a static electric charge?