Embibe Experts Solutions for Chapter: Current Electricity, Exercise 1: Exercise

The internal resistance of a cell of emf $2 \mathrm{V}$ is $0.1 \mathrm{\Omega }$. It is connected to a resistance of $0.9 \mathrm{\Omega }$. The voltage across the cell will be:

The potential difference across the terminals of a battery is $20.5 V$ when there is a current of $6.5 \mathrm{A}$ in the circuit form the negative to the positive terminal. When the current is $2 \mathrm{A}$ in the reverse direction, the potential difference becomes $25 \mathrm{V}.$ What is the emf of the battery?

The formula of resistivity $\left(\rho \right)$ is

$10 \mathrm{C}$ charge passes through a cross-section of a conductor in $5 \mathrm{s}$. Find the current.

Show the direction of the flow of electrons and direction of conventional current with the help of a figure, when a negatively charged conductor touches an uncharged conductor and a positively charged body.

Silver is a better conductor of electricity than copper. Why do we use copper wire for conduction of electricity?

What is the speed of electric current?

Explain the determination of the internal resistance of a cell using voltmeter.