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When the specification of a regulator says that output is 1A for example the whole current of the circuit will be 1A? For example I have a regulator in series with a 100Ω resistor and a 7V source.The regulator has 5v and 1A outputs. How can I calculate the whole current?

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The output current specification represents the maximum output current for that regulator.

With your example, the output current will be 5/100 = 50mA, so only 5% of the total capacity for that regulator.

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