Calculate the equivalent resistance when a wire of $10 \mathrm{ohm}$ is divided into two equal parts and connected in a parallel combination.

There are $60 \mathrm{watt}$ lamp and $80 \mathrm{watt}$ fans in a house. The lamp and the fan run for $5 \mathrm{hours}$daily. Find out the expense in a month if a unit of electricity cost $\mathrm{Rs}.4/-$(Assume that one month$=30 \mathrm{days}$)

In what combination, two resistors are to be connected so that the equivalent resistance is smaller than both the resistances?

How is the concept of resistance obtained from Ohm's law?

The potential difference between the two ends of a conductor is $V$, and the current flowing through the conductor is $I$. At a constant temperature, which of the following statement is true for the conductor?

Give an example of semi-conductor.

A thin wire and a thick wire of the same conducting material have the same length. Which one of them will carry more current when connected to the same potential difference?

Two resistance $r_1 \mathrm{and} r_2$ when connected separately to the same potential difference, it was seen that the current flowing through $r_1$ was six times the current flowing through $r_2$. Determine the ratio of $r_1$ and $r_2$.

A current of $1 \mathrm{A}$ flows when an electric bulb is connected to $220 \mathrm{V}$ mains. What would be the current when the same bulb is connected to a $110 \mathrm{V}$ main?