P 2.4-1 A current source and a resistor are connected in series in the circuit shown in

Figure P 2.4-1. Elements connected in series have the same current, so i = is in this circuit. Suppose that is = 3 A and R = 7 Ω. Calculate the voltage v across the resistor and the power absorbed by the resistor.

 

Answer: v = 21 V and the resistor absorbs 63 W

 

Figure P 2.4-1

 

Ohm’s Law provides

Which can be written as

 

Power is obtained by

 

 

 

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This page last updated on December 28, 2018