P1.1-Electric Circuits

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Abreviations

Current-Amps-A-

Voltage-Volts-V

Ressistance-Ohms-Ω

Current-I

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Circuit Symbols

Switch - two circles connected by a line. If the line connects the circles, the switch is closed. If it is only connected to one circle the switch is open. A cell - two vertical lines, one thin and one shorter and thicker. A battery - two cells connected by a dotted line. A lamp - a circle with a cross in it. A voltmeter - a letter V inside a circle. An ammeter - a letter A inside a circle. A resistor - a rectangle. A variable resistor - a rectangle with an arrow through it at 45 degrees. A motor - a letter M inside a circle. (http://www.bbc.co.uk/staticarchive/5ecbda8efd041c859385f0a8005720b587931759.gif)

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Equations

Power(W)=Voltage(V) times Current(A)

Speed=Distance/Times

Current(A)=Voltage(V)/Resistance(Ω)

Energy=Minutes in seconds/Power(Kw)

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Resistor Network

Parell Circuit

1/Resistance=1/Resistance 1+1/Resistance 2....

Series Circuit

R=R1+R2....

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Equations

2 Equations:

R=V/I & P=V*I

Rearrange:

R=V/I - I=V/R

Subsitute

Put V=I*R into P=V* I- P=(I*R)*I - PI2R

Put I=V/R into P=V*I - P=V*V/R - P=V2/R

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.

Good Luck.

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