Thevenin Equivalent Wheatstone Bridge. Thevenin equivalent resistance or thevenin equivalent resistance value can be found by calculating the value using theequation 1 2. Figure 4 3to find first we have to reattach r between to a and b put in series with r and place on the.
If a potential difference of 20 v is maintained across ac using thevenin s theorem calculate the current through the galvanometer. The four arms of a wheatstone bridge have the following resistances. R 1 1 0 kw r 2 900 w r 3 800 w and r 4.
Many if not most circuits are only linear over a certain range of values thus the thévenin equivalent is valid only within this linear range and may not be valid outside the range.
The wheatstone bridge can still be used to measure very low values of resistances. If a potential difference of 20 v is maintained across ac using thevenin s theorem calculate the current through the galvanometer. Ab 50 n bc 5 n cd 2 n da 25 n. We start by removing in theory r 5 to determine the thevenin equivalent to the resistor network composed of r 1 through r 4 the resulting circuit may be used to determine the potential and current through r 5 upon inserting this element into the thevenin equivalent circuit.
