Ohm's Law

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.

Define Ohm's law.

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 is ohm's law?

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

What is Giant Magneto Resistance?

The current passing through a resistor in a circuit is $0.01 \mathrm{A}$ when the voltage across the same resistor is $5 \mathrm{V}$. What current passes through this resistor when the voltage across it is $7.5 \mathrm{V}$?

In which direction the current flows inside a cell? ( Negative terminal to Positive terminal or Positive terminal to Negative terminal)

In which direction will the current flow inside the cell?

The current flows from positive terminal to negative terminal inside a cell.

A bulb is rated as $250 \mathrm{V} ; 0.4 \mathrm{A}$. Find its (i) resistance (ii) power.

The resistance of a conducting wire is $3.0 \mathrm{ohm}$. There is a potential difference of $1.5 \mathrm{volt}$ between the ends of the wire. Find the value of the electric current flowing in the wire.

Name the physical quantity that have the following unit.:

Coulomb

The unit of resistance is _____.

Give circuit diagram of experimental verification of ohm's law.

What is $1$ ohm resistance?

Electrical resistivity of a given metallic wire depends upon: