Ohm's Law

State ohms law with graphical representation.

Define electric shock.

Distinguish between ohmic and non-ohmic materials.

Semiconductors are examples of ohmic material.

Define ohmic materials and give examples.

The output of a digital multimeter is

What is the function of the selection knob in a multimeter?

Which device can measure the current, voltage, resistance, and has several measurement functions?

How many ports are there in a multimeter?

The display of a multimeter usually has _____ digits.

A torch bulb when cold has $1 \mathrm{\Omega }$ resistance. It draws a current of $0.3 \mathrm{A}$ when glowing from a source of $3 \mathrm{V}$. Calculate the resistance of the bulb when glowing and explain the reason for the difference in the resistance.

The resistance of the ceiling fan is changed from $200 \mathrm{\Omega }$ to $240 \mathrm{\Omega }$. Calculate how much ampere of the electric current is flowing through the ceiling fan if the potential difference is $240 \mathrm{V}$.

Write two application of Ohm's law in daily life.

The _____ of the substance changes with temperature and that is why Ohm's law is not applicable to semiconductors such as germanium and silicon.

Ohm's law is not applicable to _____ (gaseous/ solid) conductors hence, the V-I graph for such conductors is nonlinear.

Which of the following will not obey Ohm's law?

Mathematical representation of Ohm's law is:

A potential difference of $24 \mathrm{V}$ is needed to make a current of $0.06 \mathrm{A}$ flow through a given wire. What potential difference (in volts) is needed to make a current of $150 \mathrm{mA}$ flow through the same wire.

The equivalent resistance of the parallel combination of two resistors of $60 \mathrm{\Omega }$ and $40 \mathrm{\Omega }$ is _____.

An observer takes two observations as given below, while performing Ohm’s law experiment : 

Find the resistance of the conducting wire in ohms.