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lightning

rain + ice bump together = knock of electrons

top of cloud = positively charged

bottom of cloud = negatively charged

huge voltage and MASSIVE spark

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Circuits

Current - flow of electrons - AMPERE, A.

voltage - driving force that pushes current around, Electrical pressure - VOLT, V.

resistance -SLOWS things down - OHM,       .

increased voltage = MORE CURRENT.

increase resistance = LESS CURRENT.

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Ammeter

measures current - AMPS.

must be in series!

never in parralel!

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voltmeter

measures voltage - volts.

must be in parallel!

never series!

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voltage-current graphs

different resistors

 

 

filament lamp

 

 

Diode

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calculating resistance

RESISTANCE  = POTENTIAL DIFFERENCE / CURRENT

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