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The circuit here should remain unaffected , the Voltage across 2ohm resistor is given 20 V. If we replace the A-B 5 ohm resistor with which of the following a) 25V voltage source or b) 2 A current source and what polarity.

So, as Voltage across 2 Ohm resistor is 20V anyways it means current across it is 10 Amps left to right. Now that current flows through parallel resistors and divide among those 5 Ohm resistors, with 5 amperes in each. So, if i choose (+) upward 25 V source to replace the voltage across other 5 Ohm resistor increases i=V/R giving it 5 amps of extra current does the circuit remain unchanged? . How do i check for 2A current source then?

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  • \$\begingroup\$ It's unclear what you are asking here. I've read it a few times now and I'm confused about what you are asking. \$\endgroup\$
    – Andy aka
    Apr 10, 2023 at 18:11
  • \$\begingroup\$ The 5 ohm resistor is to be replaced with either a Voltage source of 25 V, or a current source of 2A so simply which of them is appropriate for this circuit. (Given Voltage across 2 ohm resistor is 20 V and though the question doesn't mention it ideal sources have to be assumed) \$\endgroup\$
    – Adyy
    Apr 10, 2023 at 18:16
  • \$\begingroup\$ What value is \$E\$? \$\endgroup\$
    – Andy aka
    Apr 10, 2023 at 18:27
  • \$\begingroup\$ Nope, its value is not mentioned and its not required either, just have to eliminate the 5ohm resistance across A-B and replace it with either of the mentioned sources. \$\endgroup\$
    – Adyy
    Apr 10, 2023 at 18:37
  • \$\begingroup\$ OK I see that now. \$\endgroup\$
    – Andy aka
    Apr 10, 2023 at 19:31

1 Answer 1

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The circuit can't remain unchanged since you're removing a resistor and adding a source. That's an obvious change.

However, the node voltages and branch currents will remain unchanged if you replace the 5 ohm resistor with a 25 V source (positive side on node "A"). There's no "extra" current since the voltage at node "A" is not changing.

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  • \$\begingroup\$ @Adyy Edited to include polarity. \$\endgroup\$
    – John D
    Apr 10, 2023 at 18:47

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