Electronics > Beginners
Conventional current vs electron current - elements in different order
nForce:
Why is there no difference if we look at the circuit and say, there is no matter in which direction current flows? The elements of the circuit (resistors, capacitors, inductors) are in a different order. If we just look at the RC filter, there is a significant change, if we put first a capacitor and then a resistor, or first a resistor and then a capacitor.
Thanks.
IanB:
Because the equations for the system are exactly the same in each case. There are some sign changes in numerical values (positive to negative) but these changes cancel out when you look at the overall signal response of the network.
IanB:
Also the elements are in the same order in each case. In typical filter network it is drawn so that the input signal comes in on the left and the output signal leaves on the right. The physical arrangement of the circuit doesn't change if you change the sign convention of current.
nForce:
Sorry, but I don't understand. If we see the schematics of the RC filter:
Here if we start at V_in, first we get to the resistor then parallel connected capacitor and finally the V_out. If we change V_in and V_out, then first we get to the capacitor then resistor, and the output.
TimFox:
The input and output nodes are labelled in time order, i.e., the change at the input causes a change at the output. This has nothing to do with the polarity of the voltages and currents.
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