Pankaj Bhatt Solutions for Chapter: Current Electricity, Exercise 1: QUESTIONS

If two resistors having resistance $4 \mathrm{\Omega }$ and $6 \mathrm{\Omega }$ are connected in parallel. Then the equivalent resistance is_____$\mathrm{\Omega }$.

A combination consists of three resistors in series. Four similar sets are connected in parallel. If the resistance of each resistor is $2 \mathrm{\Omega }$, then the resistance of the combination is_____ $\mathrm{\Omega }$.

A given wire of resistance $1 \mathrm{\Omega }$ is stretched to double of its length. Then its new resistance is_____ $\mathrm{\Omega }$.

In parallel combination of resistances

What length of copper wire(in m) of resistivity $1.7\times {10}^{-8} \mathrm{\Omega m}$ and radius $1 \mathrm{mm}$ is required so that its resistance is $1 \mathrm{\Omega }$.

Give two differences between an ohmic and non-ohmic resistor.

Explain why the p.d. across the terminals of a cell is more in an open circuit and reduced in a closed circuit.

State few differences between the e.m.f. and terminal voltage of a cell.