What is the purpose of using 2R resistor in this circuit?
closed as unclear what you're asking by Andy aka, Chupacabras, Voltage Spike, RoyC, Dave Tweed♦ Jan 14 '18 at 13:30
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It is simple RC circuit. The resistor slows down charging of the capacitor.
Typically the marking of 2R for that resistor would tell you that the value of that resistor should be 2 times the value of a similar (or referenced) resistor marked only as R somewhere else in the circuit.