S K Sharma Solutions for Chapter: Electricity, Exercise 4: UNSOLVED NUMERICALS FOR PRACTICE

An electric lamp of resistance $100 \mathrm{ohms}$ draws a current of $0.5 \mathrm{A}$. Find the line voltage.

Four resistances $1 \mathrm{\Omega }, 2 \mathrm{\Omega }, 3 \mathrm{\Omega }$ and $4 \mathrm{\Omega }$ are connected in a series with a battery of $12$ volts as shown in figure.

Calculate the current given by battery.

Four resistances $1 \mathrm{\Omega }, 2 \mathrm{\Omega }, 3 \mathrm{\Omega }$ and $4 \mathrm{\Omega }$ are connected in a series with a battery of $12$ volts as shown in figure.

Calculate the potential difference across the ends of each resistance.

Three resistance of $2\mathrm{\Omega },3\mathrm{\Omega }$ and $6\mathrm{\Omega }$ are connected (i) in series (ii) in parallel. Calculate the ratio of effective resistance of series and parallel combination of resistances.

A wire of resistance $R$ is cut into three equal parts. If these equal parts are connected in parallel, find the resistance of the combination.

Three resistors are connected in an electrical circuit as shown. Calculate the resistance between $\mathrm{A}$ and $\mathrm{B}$.

Two resistors of $6\mathrm{\Omega }$ and $3\mathrm{\Omega }$ are connected in parallel. Four such combinations are connected in series. Calculate the equivalent resistance of combination thus formed.