Manipur Board Solutions for Chapter: Electricity, Exercise 5: EXERCISES

Suppose there are a number of bulbs rated at $220 \mathrm{V}-100 \mathrm{W}$ each. How many bulbs can be connected in parallel across a $220 \mathrm{V}$supply line, if the maximum permissible current is $5 \mathrm{A}$ only?

Calculate the energy transferred in kWh by a $5 \mathrm{A}$ current flowing through a resistance of $2 \mathrm{\Omega }$ for $40$ minutes.

An electric bulb is rated at $220 \mathrm{V} -200 \mathrm{W}$. What is the resistance of the filament?

Two resistors of $10 \mathrm{\Omega }$ and $20 \mathrm{\Omega }$ are connected in series across a $12 \mathrm{V}$ battery. Calculate the power consumed by each of them respectively.

If the potential difference between the ends of a fixed resistor is doubled, to how much does the electric power change?

Which one will consume more energy — (i) a $300 \mathrm{W}$ Television set in $1 \mathrm{hr}$. (ii) $1000 \mathrm{W}$ electric heater in $10$ minutes?

State whether an electric heater will consume more or less electrical energy per second when the length of its heating element is reduced. Give an explanation for your answer.

Is it possible to have a particle with a charge $2.0 \times {10}^{-19} \mathrm{C}$?