Embibe Experts Solutions for Chapter: Electricity, Exercise 1: assam board-2019

The practical unit of electrical energy $1 \mathrm{kWh}$ means

A  current of $0.5 \mathrm{A}$ is drawn by a filament of an electric bulb for $10$ minutes. Find the amount of electric charge that flows through the circuit.

Resistance of a metal wire of length $1 \mathrm{m}$ is $26 \mathrm{\Omega }$ at $20°\mathrm{C}$. If the diameter of the wire is $0.3 \mathrm{mm}$, What will be the resistivity of the metal at that temperature?

$400 \mathrm{J}$ of heat is produced per second in a $4 \mathrm{\Omega }$ resistor. Calculate the potential difference across the resistor.

A current of $0.6 \mathrm{A}$ is drawn by a filament of an electric bulb for $5$ minutes. Find the amount of electric charge that flows through the circuit.

How electrical charges flow inside a wire. Explain.

Write the S.I. unit of resistivity. An electric motor takes $5 \mathrm{A}$ from a $220 \mathrm{V}$ source. Determine the power of the motor and energy consumed in $2$ hours.

What determines the rate at which energy is delivered by a current? An electric heater of resistance $8 \mathrm{\Omega }$ draws $15 \mathrm{A}$ from the service mains $2$ hours. Calculate the rate at which heat is developed in the heater.