What are Atoms Made Of? Protons (+) Neutrons (no charge) Electrons (-) Electricity – what’s it about?

Electrons want to be with protons (opposites attract) Electrons will move when there are not enough protons to “go around” Electricity flows from areas which are negative to areas which are positive

Electronics--Basics I.Electricity is caused by the movement of electrons. A. Electricity flows from negative(-) to positive(+)

We can control the flow of electricity if we connect a positive and negative charge with a path for the electrons to flow This closed path by which we control the flow of electrons is called a circuit.

Electronics--Basics I.Electricity is caused by the movement of electrons. A. Electricity always flows from negative to positive B. Electricity must follow a circuit

Electricity can be compared to the flow of water in a pipe water --> electrons pipe --> wire “water pressure” --> voltage The amount of water wanting to flow through the pipe

Electronics--Basics I.Electricity is caused by the movement of electrons. A. Electricity always flows from negative to positive B. Electricity must follow a circuit II. 3 Elements of a Circuit A. Voltage--Amount of electrical force applied to a circuit

Electricity can be compared to the flow of water in a pipe water --> electrons pipe --> wire “speed of water” --> current The number of water molecules that pass a given point in a given time

Electronics--Basics I.Electricity is caused by the movement of electrons. A. Electricity always flows from negative to positive B. Electricity must follow a circuit II.Three Fundamental Elements of a Circuit A. Voltage--Amount of electrical force applied to a circuit B. Current--Number of electrons which pass a point over a given time

Electricity can be compared to the flow of water in a pipe water --> electrons pipe --> wire “kink in hose” --> resistance Twisting a hose causes the water to “slow down”

Electronics--Basics I.Electricity is caused by the movement of electrons. A. Electricity always flows from negative to positive B. Electricity must follow a circuit II.Three Fundamental Elements of a Circuit A. Voltage--Amount of electrical force applied to a circuit B. Current-- Number of electrons which pass a point over a given time C. Resistance--Anything that slows down the flow of electricity

Provides the “build up” of electrons--just waiting to take off Path for Electricity to Flow

Electronics--Basics I.Electricity is caused by the movement of electrons. A. Electricity always flows from negative to positive B. Electricity must follow a circuit II.Three Fundamental Elements of a Circuit A. Voltage--The amount of electrical force applied to a circuit B. Current-- The number of electrons which pass a point over a given time C. Resistance--Anything that slows down the flow of electricity III. Four Basic parts of a circuit A. Power Source B. Path for electricity to flow

This controls the flow of electricity by breaking the circuit and cutting off the electron path By slowing down the flow of electricity, it changes electrical energy into other forms of energy

Electronics--Basics I.Electricity is caused by the movement of electrons. A. Electricity always flows from negative to positive B. Electricity must follow a circuit II.Three Fundamental Elements of a Circuit A. Voltage--The amount of electrical force applied to a circuit B. Current-- The number of electrons which pass a point over a given time C. Resistance--Anything that slows down the flow of electricity III. Four Basic parts of a circuit A. Power Source B. Path for electricity to flow C. Resistance (Consuming Device) D. Switch

Some electronic components Resistor – slows down flow Potentiometer – a resistor you can change the value of Capacitor – stores energy Photocell- changes resistance based on the amount of light