Electricity

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Electricity

• Our power today

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Volts

• Volts is the measure of electrical pressure.
  Think of pressure as pressing in all directions
  not just down.
• Things such as light bulbs need a certain number
  of input of volts to work.

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More on Volts

• Volts can also be said to be the push of
  electricity. It makes the electric flow move.
• As said in the last slide, a system that needs
  electricity needs a certain number of volts to
  work.

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Circuit

• A circuit is the path of an electrical current.
  This is mostly circular and continues.

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Amperes

• The measure of the rate and speed of electrons
  moving on a wire is measured in amperes amps.
  Amps is basically the speed at which electrons
  move.

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Watts

• Watts volt x amps. Watts is the amount of power
  or energy it takes to overcome the resistance in
  a circuit.

Wattsvolts x amps
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AC/DC

• AC is the alternating current. This is when a
  current can go to ways.
• DC is the direct current and this is when the
  current can go one way only.

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Symbols

• Motor
• Cell
• Switch open and closed
• Lamp

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More Symbols

• Resistor
• Battery
• Buzzer
• Voltmeter

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Switches

• Switches control the electricity in a circuit.
• When a switch is off, the flow stops.

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Resistance

• Resistance is the force that tries to stop the
  electrical flow or current. The sign for
  resistance is the Greek omega symbol and is
  measured in ohms.

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Light Bulbs

• Light bulbs take in the electrical current and
  send it through until it reaches the filament
  which has a very high resistance. The electrical
  flow slows so the light will be shown out.

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Circuit Drawings

• You can read circuit drawings by the symbols
  used. However the symbols may vary slightly due
  to the unofficial symbol.
• In the next few slides, I will walk you through a
  drawn circuit, what the symbols mean, and how
  its drawn.

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What this is saying is that because lamps have a
high resistance, if they are in a series then the
electrical current will be slowed substantially.
Instead, if they are parallel then the flow will
be better.
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The circuit

• That was a simple circuit. The circuits used by
  professionals are much more complex with more
  symbols.

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Alternative Energy in Electricity

• When you use alternative energy with electricity
  you attach the wires to whatever you need. So you
  use the source to turn your turbine, but once the
  turbine is turned you get electricity from the
  generator. The generator most likely has wires
  that use the energy made to go to use. Shown in
  the picture below, the solar panel channels the
  electrons through the wires to charge the
  batteries.

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Making Electricity

• To make electricity, you have to turn a turbine
  (at least for major alternative electric plants).
  They use heat to boil water so steam can turn the
  turbine to produce electricity. The picture is
  geothermal energy.

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Solar Panel

• Solar panels take the suns light and knock the
  electrons loose and channel them through to a
  circuit.

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Batteries

• Batteries store energy and release electricity.
• Its composition is a carbon rod, positive and
  negative terminal, and a chemical paste.

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Resistors

• Resistors are used to slow electrical flow so
  that the amps will slow and there is not too much
  power entering a home (overpower may cause fire).
• Below is the symbol for a resistor.

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Lightning

• Lightning is formed in a big, storm cloud. The
  mixing of electrons causes the bottom of the
  cloud to be negative, the force is strong enough
  to push earths positive particles closer to
  earth. Because the charges want to neutralize the
  other charge, there will be a pathway made, then
  the charges travel across in the form of
  lightning.

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Electricity

• Electricity is how we power our appliances and
  our materials. We will constantly find new ways
  to get electricity.