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# Ohms Law ## Structures of matter Elements are substances that are made entirely from one type of atom. ## Definitions * **Proton**: Has positive (+) charge. In the nucleus * **Neutron**: Has neutral charge, situated in the nucleus * **Electron**: Has a negative (-) charge. Orbits nucleus in sh...

# Ohms Law ## Structures of matter Elements are substances that are made entirely from one type of atom. ## Definitions * **Proton**: Has positive (+) charge. In the nucleus * **Neutron**: Has neutral charge, situated in the nucleus * **Electron**: Has a negative (-) charge. Orbits nucleus in shells at high speed. ## Laws of electric charge * Like charges repel. * Unlike charges attract. ## Graphical symbols | Component | Symbol | ANODE CATHODE | |---|---|---| | CELL | + - | | BATTERY | - + - | | RESISTOR | | | INCADESCENT LAMP | | | FUSE | | | ONE WAY SWITCH | | | AMMETER | + A - | | VOLTMETER | + V - | | OHMMETER | - Ω - | ## Electric Current Flow Electric current is the movement of free electrons through a conductor. It flows from negative to positive but conventionally from positive to negative. It is measured in Amperes. ## Conductors * Electrons move from atom to atom easily in a material. * Copper, aluminium, steel. ## Insulators * Electrons are bound tightly to their own atom. * PVC, rubber, plastic.