Review Matter is everything around you. Matter is composed of elements. Atoms are the smallest unit of an element. Atoms are made of smaller subatomic particles-protons (+ charge), neutrons (no charge), and electrons (- charge)
More notes on atoms: Protons are positively charged (+) and found in the nucleus (the center). Neutrons do not hold a charge (neutral) and are found in the nucleus. Electrons are negatively charged and spin around the nucleus.
Open circuit a circuit that is not closed, or complete, and therefore DOES NOT allow electricity to flow
Closed Circuit A complete path through which electricity can flow
Short Circuit An accidental connection of low resistance made between points in a circuit in which electric currents can flow; a short circuit prevents the circuit from working as it is supposed to work.