According to Bohr's theory (Neil Bohr), an atom consists of a central nucleus of positive charge around which tiny, negatively charged particles, called revolve in fixed orbits
In simple terms, the nucleus is made up of two fundamental particles, known as the and the
The elements are arranged according to their atomic number, which is equal to the number of protons in the nucleus.
An atom (or molecule) that has become electrically
unbalanced by the loss or gain of one or more electrons
An atom that has lost an electron is called a ion
while an atom that has gained an electron is known as a ion.
The process of producing ions is called
Electrons that have become dislodged from the outer shell of an atom are known as
are substances that permit the free motion of electrons
The best conductors from best to worst order:
When an such as that provided by a battery is connected across a conductor (opposite electrical charges, positive and negative, on each end of the wire), the free electrons are guided in an orderly fashion, atom to atom, from the negative terminal of the battery, through the wire, to the positive terminal of the battery.
electromotive force (EMF)
Unlike-charges attract and like-charges repel.
Law of Electrical Charges
Orderly drifting motion of free electrons under the application of an electromotive force (or voltage) constitutes an:
The existence of such an electric force, where current cannot flow, is referred to as or .
electrostatic force, static electricity
The pressure or force that causes free electrons to move in a conductor is referred to as either:
Difference in Potential
Electrons flow from the negatively charged body to the
positively charged body
The unit of electrical potential is the . The symbol for voltage is the letter E (electromotive force) when used in formula
The speed of the current, however, is always the same, that is, miles per second
Electric current is the impulse of electrical energy that one electron transmits to another as it changes orbit
Current is measured in one may be defined as the flow of 6.28 x 1018 electrons per second past a fixed point in a conductor, that is, 6.28 followed by 18 zeros
The longer the wire, the more resistance; The thicker the wire, the less resistance
.5' - .5Ω
1' - 1Ω
2' - 2Ω
.5 inches - 2Ω
1 inch - 1Ω
2 inches - .5Ω
k - 1000
M - 1,000,000
m - .001
μ - .000001
A in an electric circuit is a device that
usually serves a useful purpose
The Mathematical relationship between current, voltage, and resistance