Matter can exist in only two states: solid or liquid.

Direct current is described as?

Alternating current is described as?

What type of current flows in only one direction?

What type of current reverses its direction of flow at regular intervals?

The Greeks were the first to discover electricity about?

What force is demonstrated in objects with like charges?

What force is demonstrated in objects with unlike charges?

What is the smallest part of an element that still retains the properties of that element?

What are the three principle parts of an atom?

What part of an atom has a positive charge?

What part of an atom has a negative charge?

What part of an atom has no charge?

The nucleus of an atom contains?

The atomic number of an element is the number of (?) in the nucleus.

The basic law of physics states that like charges (?) and opposite charges (?).

The valence shell of an atom is the?

What is the maximum number of valence electrons in an atom?

A conductor is made from a material that contains between (?) valence electrons.

Electrical current is the flow of?

An insulator is a material containing (?) valence electrons.

A Semiconductor contains (?) valence electrons.

What is the most common method of producing electricity?