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Example 4- 1u 1' Why do you ask? Which resistance voltage is equivalent to? What is the equivalent circuit of 4-2? What is the relationship between resistances?
4- 1 It uses the superposition theorem, the voltage source is short-circuited and the current source is open-circuited.

Find the voltage between two points only when the voltage source is working. Because of the parallel connection, the voltage of both branches is 20 V.

Using the voltage division formula, the voltage of 20 ohms in the first row is the reference direction, and it is taken as -20*20/(20+20).

The voltage of 20 ohms in the second row is -20*30/(20+30).

Calculate the voltage, in fact, in the final analysis is KVL.

u-20 * 20/(20+20)+20 * 30/(20+30)= 0

Circuit equivalent diagram. . . .

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