Zero resistance wire, Energy analysis of resistors and bulbs

Energy analysis of charging and discharging

Energy analysis of charging and discharging

(a) Why does resistance increase in a series combination of resistors ? (b) Why does resistance decrease in a parallel combination of resistors ?

Wire bond resistors are made by

In the circuit shown, both cells are ideal and of fixed emf, the resistance of resistance R_(1) has fixed resistance and the resistance of resistor R_(2) can be varied (but the value of R_(2) is not zero). Then:

Statement I : In the circuit in Fig. 7.46 , both cells are ideal and of fixed emf, the resistor R_(1) has fixed resistance and the resistance of resistor R_(2) can be varied ( but R_(2) is always non zero). Then the electric power delivered to the resistor of resistance R_(1) is independent of the value of resistance R_(2) . Statement II: If potential difference across a fixed resistance is unchanged , the poweer delivered to the resistor remains constant.

For the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be

In the circuit, the galvanometer G shows zero deflection. If the batteries A and b have negligible internal resistance, the value of the resistor R will be -