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ELECTRICITY. D.C. stands for direct current which flows in one direction only (- to +) A.C.stands for alternating current which changes direction 50 times per second. ELECTRICITY. D.C. is seen as a straight line on the oscilloscope. A.C. is seen as a wavey line on the oscilloscope.

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Presentation Transcript
electricity
ELECTRICITY

D.C. stands for direct current which flows in one direction only (- to +)

A.C.stands for alternating current which changes direction 50 times per second.

electricity1
ELECTRICITY
  • D.C. is seen as a straight line on the oscilloscope.
  • A.C. is seen as a wavey line on the oscilloscope.
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ELECTRICITY
  • An electric current is a flow of charged particles called electrons.
  • You will see the circuit symbols on the side wall.
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ELECTRICITY
  • Current has the symbol I and is measured in amps (A)
  • Resistance has the symbol R and is measured in ohms (W)

Voltage has the symbol V and is measured in volts(V)

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ELECTRICITY
  • Current is measured with an ammeter in series.
  • Voltage is measured with a voltmeter in parallel.
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ELECTRICITY
  • V = IxR

V

I

R

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