Magnetism & Electromagnetism Electric Current & Magnetic Fields Chapter 1 Section 3

Electric Charge Protons “+” Electrons “-”

Electric Current The measure of the amount of charge flowing past a given point each second Measurement for current Ampere Amp, A

Electric Current Produces a magnetic field Changing the direction of the current changes the direction of the magnetic field

Electric Circuit A complete path through which electric charges can flow

Conductors & Insulators Electrons are loosely bound to atoms Electrons can flow Metals Insulator Electrons are tightly bound to atoms Electrons do not flow Plastics Wood Glass Rubber

Resistor Uses electrical energy as it interferes (or resists) the flow of charge Produce… Light Heat

Lightbulbs Tungsten wire Conducts electricity, but heats up enough to glow

Superconductors A material that has no electrical resistance Repel magnets Occurs in some materials very high temps very low temps