electrical energy- static and current. electrons are a small part of an atom they are found orbiting...
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Electrical Energy- static and current
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electrons
• Are a small part of an atom
• They are found orbiting around the nucleus of atom
• They carry a negative charge
• When they move from atom to atom that is electricity
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electricity
• Two forms: • Static: When electrons build up on
the surfaces of objects and then jump away =(zap!)
• Current: When electrons flow in a conductor (usually metal)
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charge
• Is like a force that affects parts of atoms
• Things can have a positive charge, a negative charge, or be neutral
• Similar charges repel • Unlike charges attract
• “opposites attract”
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Static Electricty
• By rubbing objects together, electrons can build up on one object (think balloon activity!)
• The electrons are all alike, so they try to get away from each other as best as they can
• Provide them with a way out and they will take it! (John Travoltage!)
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Positive / negative charges
• Objects with a negative charge have an excess of electrons on their surfaces
• Objects with a positive charge have less electrons on their surface
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Conduction
• When charges can flow from one object to another
• They need to touch: conduction= contact
• Metals (like copper, gold) are good conductors
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Current Electricity• Series Circuits• 1 directional flow• 1 element stops
working the entire circuit does not work
• Parallel Circuits• 2 or more
directional flow• Circuit remains
functional even without working elements
http://www.andamooka.org/reader.pl?pgid=liecDCDC_5
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Energy Flow Cont’d• Electrons (negative charges) flow
in the opposite direction – from the negative terminal
• If a circuit is not a complete loop it will not work as intended
• No electrical connection is made and the current stops
• An incomplete loop is called an open circuit
• Electricity only flows through a closed circuit!
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Energy Flow• Energy that flows through a circuit is
called a current or amperage, measured in amps
• “Pressure” of that energy flow is called voltage, measured in volts
• When hooked up to a battery the current flows out of the negative (-) end and around through the circuit back into the positive (+) end
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More Energy Flow
• Resistance occurs when something extra is introduced into the circuit (i.e. light bulb). This is called a Load.
• More light bulbs = more resistance• More resistance = less current =
dimmer light produced
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AC or DC?• Alternating current• Ex. power plant• Direction of the
current reverses; can easily change the voltage (with transformers)
• Direct current• Ex. batteries, fuel
cells, solar cells• Current flows in
one direction from negative terminal to positive terminal
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Electricity Basics• 3 basic units in electricity
• Voltage (V), measured in volts• Current (I), measured in amps• Resistance (r), measured in ohms
I = V / r
Increasing voltage will make more current flow
Decreasing resistance will also make more current flow