What to do in a RC parallel circuit? Determine wich criteria you are analising, if the criteria is the time the voltage in capacitor takes to reache the supply voltage, the time constant is 0 if you have an ideal supply voltage and RinC if Rin is the resistance in serie with the capacitor. So, When asking about time constante in a RC serie circuit we build a transfer function that has the form 1/ (τS + 1) wich is a first order system with a time constant τ = RC. What we must do to determine time constant ? is a good idea to Analize the transfer function ? it is a good idea to determine which critria should be observed ? So, lets do other question: What is the time constant in a thermo measurement system ? It is the time necessary to the system respond with xx% when a step change in temperature is applied. What is the time constant in a RC series circuit ? It is the time necessary to capacitor reaches XX% of the supply, Right ? In order to answer this question, first we must define time constant.
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