9.1

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             

True/False

The elements are arranged according to their atomic number, which is equal to the number of protons in the nucleus.
True False

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:

Insulators

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.

Unlike-charges attract and like-charges repel.

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                   .

The pressure or force that causes free electrons to move in a conductor is referred to as either:

True/False

Electrons flow from the negatively charged body to the
positively charged body
True False

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

True/False

Electric current is the impulse of electrical energy that one electron transmits to another as it changes orbit
True False

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

Resistance

True/False

The longer the wire, the more resistance; The thicker the wire, the less resistance
True False

kilo
mega
mili
micro

A                 in an electric circuit is a device that
usually serves a useful purpose

The Mathematical relationship between current, voltage, and resistance