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EE302Lecture5 - Power Calculation Examples What value of a...

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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)
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? 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
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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 Ohm’s 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
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  1,380W are absorbed by the remainder of the   circuit. 4
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Resistor Current I - Voltage V Characteristic The I-V characteristic of a resistor is a straight line. 5 = Conductivity  
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Diode i-v Characteristic of a diode Diodes are nonlinear devices The i-v characteristic is not a straight line or we    would say it is non-linear.
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