Lakhmir Singh and Manjit Kaur Solutions for Chapter: Magnetic Effect of Electric Current, Exercise 26: Questions Based on High Order Thinking Skills (HOTS)

A vacuum cleaner draws a current of $2 \mathrm{A}$ from the mains supply. What is the appropriate value of the fuse to be fitted in its circuit?

A vacuum cleaner draws a current of $2 \mathrm{A}$ from the mains supply. What will happen if a $13 \mathrm{A}$ fuse is fitted in its circuit?

Which of the following circuits will still be dangerous even if the fuse blows off and electric iron stops working during a short-circuit?
 
                        (A)                                           (B)

An electric kettle rated as $1200 \mathrm{W} at 220 \mathrm{V}$ and a toaster rated as$1000 \mathrm{W} at 220 \mathrm{V}$ are both connected in parallel to a source of $220 \mathrm{V}$. If the fuse connected to the source blows when the current exceeds $9.0 \mathrm{A}$, can both appliances be used at the same time? Illustrate your answer with calculations.

What is the main difference in the wiring of an electric bulb and a socket for using an electric iron in a domestic electric circuit? What is the reason for this difference?

Explain why, it is more dangerous to touch the live wire of a mains supply rather than the neutral wire.

Why is it safe for birds to sit on naked power lines fixed atop tall electric pole?

A domestic lighting circuit has a fuse of $5 \mathrm{A}$. If the mains supply is at $230 \mathrm{V}$, calculate the maximum number of $36 \mathrm{W}$ tube-lights that can be safely used in this circuit.