If the potential difference applied across a variable resistor is constant, draw a graph between the current in the resistor and the resistance.

When a potential difference is applied across, the current passing through

The values of current (I) flowng through a given resistor of resistance (R ), for the corresponding values of potential difference (V) across the resistor are as given below : Plot a graph between current (I) and potential difference (V) and determine the resistance (R ) of the resistor.

While stud dying the dependence of potential difference (V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and I. He got a straight line graph passing through the origin. What does the straight line signify? Write the method of determining resistance of the resistor using this graph.

A cell of e.m.f. 'E' and internal resistance 'r' is connected across a variable resistor 'R'. Plot a graph showing the variation of terminal potential 'V' with resistance R. Predict from the graph the condition under which 'V' becomes equal of 'E'

find the currents in the different resistor shown in figure.

Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistance of 2 Omega in series with a combination of two resistors ( 4 Omega each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 Omega resistor be the same as that across the parallel combination of 4 Omega resistors ? Give reason.

A constant potential difference is applied across a resistance. Consider variation of resistance with temperature. Which graph represents best the variation of power produced in resistance versus resistance?

The sinusoidal potential difference V shown in figure applied across a resistor R produces heat at a rate W. What is the rate of heat disspation when the squre wave potential diffrence V_(2) as shown in figure is applied across the resistor?

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.

Find the currents in different resistors shown in figure