List of top Physics Questions on Resistance

A current of 2 A flows through a conductor with a resistance of 5 $\Omega$. Calculate the potential difference across the conductor.

The effective resistance between points A and B in the given circuit is:

A wire of resistance $ R $, connected to an ideal battery, consumes a power $ P $. If the wire is gradually stretched to double its initial length, and connected across the same battery, the power consumed will be:

A cell of emf $ E $ and internal resistance $ r $ is connected to an external variable resistance $ R $. Plot a graph showing the variation of terminal voltage $ V $ of the cell as a function of current $ I $, supplied by the cell. Explain how the emf of the cell and its internal resistance can be found from it.

A wire of resistance $ R $ is bent into a triangular pyramid as shown in the figure, with each segment having the same length. The resistance between points $ A $ and $ B $ is $ \frac{R}{n} $. The value of $ n $ is:

A wire of resistance $ X \, \Omega $ is gradually stretched till its length becomes twice its original length. If its new resistance becomes 40 $ \Omega $, find the value of $ X $.

Find the effective resistance of the network of resistors between points A and F as shown in the figure.

The ends of six wires, each of resistance R

The graph between variation of resistance of a wire as a function of its diameter keeping other parameters like length and temperature constant is

A coil of resistance 10 $ \Omega $ is connected to a battery of 12 V. If the current flowing through the coil is 2 A, what is the power dissipated in the coil?

A resistor of resistance $ 10\, \Omega $ is connected across a $ 20\, V $ battery. Calculate the current flowing through the resistor.

What is the resistance of a conductor if the potential difference across it is 12 V and the current flowing through it is 3 A?

A carbon resistor has a tolerance of 20\%. As per the colour codes of resistors, the last band in that resistor is

A wire of resistance 10 $\Omega$ is stretched to twice its original length. What is the new resistance?

Two resistors of $4\, \Omega$ and $6\, \Omega$ are connected in parallel. What is the equivalent resistance?

The heat produced in a $ 4 \, \Omega $ resistor when an electric current of $ 5 \, A $ flows in it for $ 2 $ seconds is

Identify the wrong statement among the following:

SI unit of electrical resistivity is

When a current of 2 A flows through a wire for 2.5 s, the amount of heat liberated is 20 J. The resistance of the wire is

A galvanometer having coil resistance 10 Ω shows a full scale deflection for a current of 3 mA. For it to measure a current of 8 A, the value of the shunt should be:

In a given circuit, an ideal battery is connected with four resistances as shown. Find current $i$ as mentioned in the diagram.

If the percentage error in measuring length and diameter of a wire is $0.1\%$ each, then the percentage error of the resistance of the wire is :

In the meter bridge shown below, the null point is at 40 cm from A. If R is shunted by 22, find the distance of new balance point from A

Two resistances having coefficient of variation of resistivity $α_1$ and $α_2$ are having equal resistance. Equivalent temperature coefficient of resistivity in series and parallel combinations are:

Primary coil of a transformer is connected to 220 V ac. Primary and secondary turns of the transforms are 100 and 10 respectively. Secondary coil of transformer is connected to two series resistance shown in shown in figure. The output voltage (V0) is :

An electric toaster has resistance of $ 60 \, \Omega $ at room temperature $ (27^\circ \text{C}) $. The toaster is connected to a 220 V supply. If the current flowing through it reaches 2.75 A, the temperature attained by the toaster is around: (if $ \alpha = 2 \times 10^{-4} / ^\circ \text{C} $)