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Unformatted text preview: Power Calculation Examples: What value of a resistor dissipates 10 W of power when a current of 2 A flows through it? Use P = I 2 R 1. 40 2. 20 3. 10 4. 5 5. 2.5 What value of a resistor dissipates 10 W of power when connected to 20 volts? Use P = V 2 /R 1. 40 2. 20 3. 10 4. 5 5. 2.5 1 10 = (2 2 )(2.5) 10 = (20 2 )/(40) ? Example 1  What is the power associated with each circuit element? The information that is given is:  We know Ix=3A (left side), therefore 2Ix=6A (on the right side). This same current flows through element C.  Power is conserved. 1120W are supplied and 1120W are absorbed. Two sources act as loads. 2 Example 2  What is the power associated with each circuit element? Same circuit as Example 1 except for the dependent current source which has reversed the direction of Ix=3A to Ix=3A. We are given the information shown below: This time we use Ohms Law or other power equations to calculate the power in the 20 ohm resistors.  Power is conserved. 1,380W are provided by the current sources and 3 1,380W are absorbed by the remainder of the circuit. 4 Resistor Current I  Voltage V Characteristic The IV characteristic of a resistor is a straight line. 5 = Conductivity Diode  iv Characteristic of a diode  Diodes are nonlinear devices The iv characteristic is not a straight line or we would say it is nonlinear....
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This note was uploaded on 10/06/2008 for the course EE 302 taught by Professor Mccann during the Fall '06 term at University of Texas at Austin.
 Fall '06
 MCCANN

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