What is the symbol used to denote the unit of resistance,ohm?

How much current will an electric bulb of resistance $1100 \ \Omega$ draw from a $220 \ V$ source? If a heater of resistance $100 \ \Omega$ is connected to the same source instead of the bulb,calculate the current drawn by the heater.

The $I-V$ graph for a given metallic wire at three different temperatures is shown. Which of these represents the highest temperature?

Insulators like wood and rubber have a very low electrical resistance.

Why are alloys used to make standard resistors?

In the circuit diagram shown,the two resistance wires $A$ and $B$ are of the same area of cross-section and same material,but $A$ is longer than $B$. Which ammeter,$A_{1}$ or $A_{2}$,will indicate a higher reading for current? Give a reason.