Resistance%20SU10 - R1 RESISTANCE All materials(even your...

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R 1 RESISTANCE All materials (even your body) have some resistance to current flow. A RESISTOR is a circuit element that dissipates (consumes) energy from the driving source (such as a power supply, battery, photovoltaics) and is not returned to the circuit. (Energy is dissipated as heat) (a resistor restricts current flow as well as lowers voltage) OHM'S LAW - the most used law in electrical circuit analysis relates voltage, current and resistance: V = I R [ E = I R ] Where: V = voltage, volt (V) (E – electromotive force) I = current, ampere or amps (A) R = resistance, ohms ( ) Example: What is the current flowing in the resistive circuit? 10 V + _ i R = 10 i = V / R = 10 V / 10 = 1 A
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R 2 POWER IN A Resistive CIRCUIT (only resistors present) Recall that P = V I , so substituting for V leads to: P = I 2 R (since V = I R) also P = V 2 / R For the previous example, P = (1) 2 (10) = 10 W CONDUCTANCE (G) Inverse of R, so G = 1 / R Unit: Siemens (S) = mho ( ) = 1 / ohm I = G V
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This note was uploaded on 05/21/2011 for the course CGN 3710 taught by Professor Bloomquist during the Summer '10 term at University of Florida.

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Resistance%20SU10 - R1 RESISTANCE All materials(even your...

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