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

If the valence electrons exactly fill one or more bands, leaving other empty, then the crystal will be 

The reading of a high resistance voltmeter, when a cell is connected across it is $2.2 \mathrm{V}$. When the terminals of the cell are also connected to a resistance of $5 \mathrm{\Omega }$  as shown in the circuit, the voltmeter reading drops to $1.8 \mathrm{V}$. The internal resistance of the cell is:

The resistance of a conductor carrying a current $3 \mathrm{A}$ which has a potential difference of $15 \mathrm{V}$ between its two ends is

Identify the correct variation of drift velocity $\left(v_d\right)$ with electric field strength $\left(E\right):$

Constantan wire is used in making standard resistances because its

Copper and Silicon are cooled from $300 \mathrm{K}$ to $60 \mathrm{K}$. The specific resistance

The temperature  $\left(T\right)$ dependence of resistivity $\left(\rho \right)$ of a semiconductor is represented by

A heater coil is cut into two equal parts and only one part is used for heating. The heat generated will now be