Electricity

Form of energy Involves movement of electrons Can be transferred into light, heat, sound, mechanical, and magnetic energy Example: electromagnets- magnets that carry an electric current- makes them really strong Ways to make electromagnets stronger: Increase electric current Increase amount of coils Larger core

Electricity Electric current- movement of electrons (negatively charged) through a conductor. Static electricity- a charge that builds up when two objects rub together because of an imbalance of positive and negative charges Opposite charges attract and alike charges repel

Conductors and Insulators Conductor- any material that allows electrical charges to travel easily through it Examples: metal and water Insulator- any material that does not easily let electrical charges travel through them Examples: rubber, glass, wood

Resistors Material that resists the flow of an electric charge As current moves through a resistor, some of electrical energy changes to thermal energy Example: coiled wire in light bulb

Electric Circuits Open circuit- has breaks; incomplete circuit Closed circuit- does not have breaks; complete circuit Two types of complete (closed) circuits: Series circuit- only one path for the electrons to flow Parallel circuit- more than one path for the electrons to flow

Circuit Diagram Map of a circuit Has a key for reading a circuit diagram Volts (v)- measure of electrical force provided by an energy source