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OHM’S LAW TO UNDERSTAND OHM’S LAW WE MUST FIRST LEARN SOME SIMPLE ELECTRICAL SYMBOLS: SINGLE CELL FUSE SINGLE ACTION SWITCH CAPACITOR BULB RESISTOR
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MOTOR VEHICLE ELECTRIC’S
INTRODUCING
OHM’S LAW BY PAUL LANE
Ohm, Georg Simon
BORN: March 16, 1789, Erlangen, Bavaria [Germany]DIED: J uly 6, 1854, Munich
German physicist who discovered the law, named after him,which states that the current flow through a conductor is directlyproportional to the potential difference (voltage) and inverselyproportional to the resistance.Ohm became professor of mathematics at the J esuits' College atCologne in 1817. While his work greatly influenced the theory andapplications of current electricity, it was so coldly received thatOhm resigned his post at Cologne. He accepted a position at thePolytechnic School of Nürnberg in 1833. Finally his work began tobe recognized; in 1841 he was awarded the Copley Medal of theRoyal Society of London and was made a foreign member a yearlater. The physical unit measuring electrical resistance was givenhis name: OHMS LAW.
WHERE DID OHM’S LAW COME FROM?
OHM’S LAWTO UNDERSTAND OHM’S LAW WE MUSTFIRST LEARN SOME SIMPLE ELECTRICALSYMBOLS:
SINGLE CELL
FUSE
SINGLE ACTION SWITCH
CAPACITOR
BULB
RESISTOR
ELECTRICAL SYMBOLS
ONE WAY DIODE
VARIABLE RESISTOR
EARTH
WIRES CROSSING
WIRES JOINING
IGNITION COIL
CONTACT POINT
OHM’S LAW
WHAT IS OHM’S LAW?
V= I R
Where: V = VOLTAGE I = CURRENTR = RESISTANCE
EXAMPLE:A 12 VOLT BATTERY SUPPLIES POWERTO A HEATED REAR WINDOW WHICHHAS A RESISTANCE OF 18 OHM’S.
CALCULATE HOW MUCH CURRENT IS FLOWING THROUGH THE HEATED WINDOW.
V = 12 VOLTSR = 18 OHM’S
V
I R
USING THIS SIMPLE TRIANGLEWE CAN SEE THAT:
I = VR
I = 1218
I = 0.6
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