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What are Atoms Made Of?
Protons (+)
Neutrons (no charge)
Electrons (-)
Electricity – what’s it about?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(+)
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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 positiveB. 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
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Provides the “build up” of electrons--just waiting to take off
Path for Electricity to Flow
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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
R11k
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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
R11k
+ V110V
Electronics--BasicsI. 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
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