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I want to ask something that I see in the circuit. As follows, enter image description here

What is the purpose of using 2R resistor in this circuit?

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    \$\begingroup\$ Replaced comment with answer below. \$\endgroup\$ – Nedd Jan 12 '18 at 6:17
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    \$\begingroup\$ Add whole circuit to your question, please. Not just a small section. \$\endgroup\$ – Chupacabras Jan 12 '18 at 6:34
  • \$\begingroup\$ Your question is unclear. Are asking what is purpose of resistor in this RC circuit? Or are you asking what is the meaning of "2R" value? \$\endgroup\$ – Chupacabras Jan 12 '18 at 6:36
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It is simple RC circuit. The resistor slows down charging of the capacitor.

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    \$\begingroup\$ But 2R is too small, is not it? \$\endgroup\$ – Onur Bayrak Jan 12 '18 at 6:26
  • \$\begingroup\$ @OnurBayrak That is another question! You have asked what is purpose of that resistor, haven't you? \$\endgroup\$ – Chupacabras Jan 12 '18 at 6:33
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    \$\begingroup\$ Yes, I said that \$\endgroup\$ – Onur Bayrak Jan 12 '18 at 6:42
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    \$\begingroup\$ @OnurBayrak Then my answer is exactly about that. \$\endgroup\$ – Chupacabras Jan 12 '18 at 7:01
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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.

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  • \$\begingroup\$ OK, two ways of looking at this. Did you want to know what is the purpose of the using the designation "2R" ? Or were you asking what is the function of the resistor marked as 2R? \$\endgroup\$ – Nedd Jan 12 '18 at 6:27
  • \$\begingroup\$ What is the function of the resistor marked as 2R? \$\endgroup\$ – Onur Bayrak Jan 12 '18 at 6:44
  • \$\begingroup\$ OK, so the answer from Chupacabras is more fitting. But from your other comment don't assume 2R means 2 Ohms. \$\endgroup\$ – Nedd Jan 12 '18 at 7:35
  • \$\begingroup\$ I have never seen that as a convention, typically in the circuits I have seen, 2R would be a 2 ohm resistor, similar 2K would be 2000 ohms and 2M would be 2000000 ohms. \$\endgroup\$ – Colin Jan 12 '18 at 9:34

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