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

2. Electric Charge
Protons
“+”
Electrons
“-”

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

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

5. Electric Circuit
A complete path through which electric charges can flow

6. 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

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

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

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