Is voltage zero when a current source is present?
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you cannot find the voltage across the current source ideally.
Voltage can exist even if current is not flowing (i.e circuit is open) but current can only flow of the circuit is closed. Circuit will be closed with the help of some resistor. So the entire voltage will drop across that resistor which can be taken as voltage across current source.
As you can take any value of Resistor, so the voltage across the current source can be anything. That's why we can't find the voltage across current source
Voltage can exist even if current is not flowing (i.e circuit is open) but current can only flow of the circuit is closed. Circuit will be closed with the help of some resistor. So the entire voltage will drop across that resistor which can be taken as voltage across current source.
As you can take any value of Resistor, so the voltage across the current source can be anything. That's why we can't find the voltage across current source
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