The amount of current flowing through a resistor varies directly as the amount of potential difference applied across the resistor as long as other variables, such as temperature, are controlled. There is a resistance of 1 ohm when 1A of current flows with a potential difference of 1 V across a resistor.
Factors that determine resistance:
Resistance of a conductor depends on its length, cross-sectional area, the material made of, and its temperature.
Definition:
conservation of electric charge- there is no net gain or loss of electric charge or energy.
conservation of energy- there is no net gain or loss of electric charge or energy.
gauge number- number on wire that indicates its cross-sectional area
resistance- a measure of the opposition to current flow
LAWS
Ohm's law- the ratio of V/I
Kirchhoff's current law- the total amount of current into a junction point of a circuit equals the total current that flows out of the same junction.
Kirchhoff's voltage law- the total of all electrical potential decreases in any complete circuit loop is equal to any potential increase in that circuit loop.
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Series Circuit
It = I1 = I2 ....Vt= V1 + V2 ...
Rt= R1 + R2...
Parallel Circuit
Factors that affect Resistance
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