What do you mean by short circuit?

The diagram below shows a dual control switch circuit connected to a bulb. Out of A & B which one is the live wire and which one is the neutral wire? 

Select the most correct alternative given below each statement and write the completed statement:
An electric fuse is used to ________

A house has $3$ tube lights, $2$ fans and a television. Each tube lights draws $40 \mathrm{W}$. The fan draws $80 \mathrm{W}$ and the television $60 \mathrm{W}$. On an average, all the tubelights are kept on for five hours, two fans for $12$ hours each and the television for five hours a day. Find the cost of electric energy used in $30$ days at the rate of Rs $3.00$ per $\mathrm{KWH}$.

Electricity and magnetism are linked to each other.

Two fuse wires A and B of the same length but rated $20 \mathrm{A}$ and $10 \mathrm{A}$ respectively which will be more thicker and why?

In domestic electric circuit the fuse wire is connected to which of the following?

Differentiate between the following.

Heating effect and magnetic effect of current