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operating current? Answered

hi, i dont clearly understand the operating current 20MA concept, do youthink you can tell me how to find this ?

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Your question is unclear. Can you perhaps ask it differently? Are you trying to select a resistor?

The operating current is what you need to have the circuit running properly. You need to know this so that you can get enough batteries with enough voltage to drive it. Batteries usually get hot if you expect them to give you too much current.