Resistors
Figure shows a network of resistances connected to a 2V battery. If the internal resistance of the battery is negligible, current I in the circuit is
Because P/Q = R/S, the circuit is a balanced Wheatstone's bridge. Therefore, potential at B = potential at D. Hence no current flows through the 5 resistor; it is, therefore, not effective. The equivalent resistance between A and C is the resistance of a parallel combination of P+R = 2+4 6 and Q+ S= 4+8 12, which is given by
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