EMF Electromotive force 10 20 14 9 19 AM Energy per unit charge supplied by the battery A battery is a charge separator it does not product charge o Examples Terms Resistor any circuit element which has an Ohmic response current proportional to the change in voltage Resistance depends on different factors the temperature dependence o Resistors in Parallel Resistors in Series Example of solving a complicated circuit Kirchloff s Laws 1 Net current entering a junction equals net current leaving Charge conservation o Junction a point where three or more conductors meet 2 Signed sum of potential changes around a loop of circuit is zero o o Conventions Voltage source traversed From negative to positive Delta V emf From positive to negative Delta V emf Example Substitute some more then you get that o I2 5 Amps and o I3 1 Amps therefore the direction of I3 is the opposite that we guessed From these we know that I4 4 Amps and I5 7 Amps R equivalent V I 13 11 1 2 Ohms
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