Subject Experts Solutions for Chapter: Electricity, Exercise 4: Exercises

Explain three electrical hazards.

A fan of $60 \mathrm{W}$ runs for $75$ hours in a month. How much electrical energy is consumed?

An electric kettle rated $2.2 \mathrm{kW}$ works for $4$ hour a day. Calculate the number of units produced by it in $20$ days.

A heater is rated at $5 \mathrm{kW}$. Calculate the cost of energy consumed by it in $30$ days. If it is run for $2$ hours daily. The cost of $1 \mathrm{kWh}$ is priced at  $₨ 4.20$.

Five LED bulbs of $8 \mathrm{W}$ each, two fans of $40 \mathrm{W}$ each, an electric motor with $3 \mathrm{kW}$, and a geyser of $5 \mathrm{kW}$ are used for $8$ hours a day by a family. Calculate the total energy consumed in $30$ days and the cost of electricity used in one day at the rate of $₨ 5$ per unit.

Yashika was given an electroscope with its gold leaves diverged. What do the diverged leaves indicate?  She was also given a rod which she did not know was charged or not. Yashika touched the rod to the cap of the electroscope to find that the divergence of the gold leaf decreased. What should she infer about the charge status of the rod?

Draw the diagram for identifying the nature of charge of an object using a positively charged electroscope.

Draw the diagram of a lightning conductor.