List of top Physics Questions on Resistance

Three resistors $1\,\Omega , 2\,\Omega$ and $3\,\Omega $ are connected to form a triangle. Across $3\,\Omega$ resistor a $3\,V$ battery is connected. The current through $3\,\Omega$ resistor is
Two electric bulbs marked $25W - 220V$ and $100W - 220\, V$ are connected in series to a $440\, V$ supply. Which of the bulbs will fuse ?
The maximum power dissipated in an external resistance R, when connected to a cell of emf E and internal resistance r, will be
The resistance of an ideal voltmeter should be infinite. The lower resistance of voltmeters gives a reading lower than the actual potential difference across the terminals.
The current- voltage graph for a given metallic wire at two different temperatures t) and $ {{T}_{1}} $ and $ {{T}_{2}} $ is shown in the figure. The temperatures $ {{T}_{1}} $ and $ {{T}_{2}} $ are related as
A $d.c$. battery of $V$ volt is connected to a series combination of a resistor $R$ and an ideal diode $D$ as shown in the figure below. The potential difference across $R$ will be
The effective resistance between points A and C for the network shown in figure is
In the adjacent shown circuit, a voltmeter of internal resistance $R$, when connected across $B$ an $C$ reads $\frac{100}{3} V$. Neglecting the internal resistance of the battery, the value of $R$ is
Specific resistance of a conductor material increases with
The resistance of a wire at $300 \, K$ is found to be $0.3 \, \Omega$. If the temperature co-efficient of resistance of wire is $1.5 \times 10^{-3} K^{-1}$, the temperature at which the resistance becomes $0.6\, \Omega$ is
In an experiment of Wheatstone bridge, a null point is obtained at the centre of the bridge wire. When a resistance of $10 \, \Omega $ is connected in one gap, the value of resistance in other gap is
Seven resistances are connected as shown in the given figure. The equivalent resistance between $A$ and $B$ is
In the circuit shown the equivalent resistance between $A$ and $B$ is
Three resistances of $4 \,\Omega$ each are connected as shown in figure. If the point $D$ divides the resistance into two equal halves, the resistance between point $A$ and $D$ will be
In an a.c. circuit the emf (e) and the current (i) at any instant core given respectively by \(e = E_0 sin ωt\), \(I = I_0 sin (ωt – ɸ)\). The average power in the circuit over one cycle of a.c. is.
The equivalent resistance between the points $A$ and $B$ will be (each resistance is 15 $\Omega$)
The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be
A material B? has twice the specific resistance of ?A?. A circular wire made of B? has twice the diameter of a wire made of ?A?. Then for the two wires to have the same resistance, the ratio $l_{B} / l_{A} $ of their respective lengths must be :
The temperature coefficient of resistance of a wire is $0.00125/K$. At $300\,K$ its resistance is 1 $\Omega$ .The resistance of the wire will be 2 $\Omega$ at
An aluminium rod and a copper rod are taken such that their lengths are same and their resistances are also same. The specific, resistance of copper is half that of aluminium, but its density is three times that of aluminium. The ratio of the mass of aluminium rod and that of copper rod will be
The resistance of a wire at room temperature $ 30{}^\circ C $ is found to be $ 10\,\Omega $ . Now to increase the resistance by 10%, the temperature of the wire must be [The temperature coefficient of resistance of the material of the wire is $ 0.002/{}^\circ C $ ]
The resistance of an ammeter is $13\, \Omega$ and its scale is graduated for a current upto $100\, A .$ After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto $750\, A$ by this meter . The value of shunt resistance is
A cell of constant emf first connected to a resistance $R_1$ and then connected to a resistance $R_2$. If power delivered in both cases is same then the internal resistance of the cell is :
Three resistances of values 2$\Omega$, 3$\Omega$ and 6$\Omega$ are to be connected to produce an effective resistance of 4$\Omega$ . This can be done by connecting
The resistance of a field coil measures 50$\Omega$ at 20?C and 65$\Omega$ at 70?C. The temperature coefficient of resistance is