P 5.3-4 Use superposition to find the value of the voltage v in Figure P 5.3-4.

Figure P 5.3-4

First turn off the 6 A source and we have

Find the current in the 20 Ω resistor by using current division

So the voltage due to the 9 A source is

Now turn off the 9 A source and we have

Find the current in the 20 Ω resistor by using current division

So the voltage due to the 6 A source is

So the voltage is the sum of the voltages from each source, so

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This page last updated on February 18, 2019