Ohm's Law

Raman wants to draw a graph to show how the resistivity $\left(\rho \right)$ of a wire changes with the length $\left(l\right)$ of the wire. What should his graph look like?

The circuit below consists of a variable resistor connected in series with two $2000 \mathrm{\Omega }$ resistors. The variable resistor can be adjusted to any value between $0 - 4000 \mathrm{\Omega }$.

As the resistance of the variable resistor is changed, what is the smallest possible reading on the voltmeter?

What do you interpret from this cartoon?

State ohms law with graphical representation.

Two wires P and Q are made from the same material. Wire P and Q has a length in the ratio of $18:12$ and having a cross-sectional area in the ratio of $4:3$. Then the ratio of their resistances is:  

Define Ohm's law.

The resistance of$5 \mathrm{kg}$of a material in the form of a cube of side $\mathrm{l}$ is $\mathrm{R}/2$ , when measured across any two opposite faces. If $5 \mathrm{kg}$ of same material is used as a rectangular block of length $\text{'}2\mathrm{l}\text{'}$, the resistance across its length will be 

The resistance of an electric wire, of an alloy is $10 \mathrm{\Omega }$. If the thickness of the wire is $0.001 \mathrm{m}$ and length is $1 \mathrm{m}$, find its resistivity.

Draw a relationship between potential difference and current.

Find the current through the circuit shown in figure. Also, find the potential difference across the $20 \mathrm{\Omega }$ resistor.

What potential difference is needed to send a current of $6 \mathrm{A}$ through electrical appliance having resistance of $40 \Omega$.

Who invented ohm's law?

What is ohm's law?

The resistance of a $1 \mathrm{m}$ long nichrome wire is $6 \mathrm{\Omega }$. If we reduce the length of the wire to $70 \mathrm{cm}$. What will its resistance be? 
 

An electric heater draws $3.5 \mathrm{A}$ from a $110 \mathrm{V}$ source. The resistance of the heating element is approximately.

Why the ratio of the potential difference to the current is known as resistance?

An electrical circuit was set up as shown below. Find the current flowing through each of the resistances in the circuit.

A cylindrical conductor of length $l$ and uniform area of cross-section $A$ has resistance $R$. Another conductor of length $2.5 l$  and resistance $0.5 R$ of the same material has area of cross-section:

Two wires A and B are of equal length and have equal resistance. If the resistivity of A is more than that of B which wire is thicker and why?

List out the material required for the experiment 'The effect of increasing of section of a conductor upon its resistance" and write the experimental procedure.