# NCERT Class VII Science Solutions: Chapter 14-Electric Current and Its Effects Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 13:

Can we use the same fuse in a geyser and a television set? Explain.

No, a geyser and a television set require different amount of current. Therefore the fuse used in these will be of different ratings.

Question 14:

Name two electric devices for each where (i) heating effect of current is used and (ii) magnetic effect of current is used.

Heating effect – Geyser, room heater

Magnetic effect – Electric bell, Cranes to lift magnetic material.

Question 15:

Why do we cover plug pin holes which are within the reach of children with cello tape or a plastic cover when not in use?

The child may put his/her fingers into the socket and he/she may get an electric shock which could be fatal.

Question 16:

Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electro magnet will attract more pins? Give reason.

Paheli՚s electromagnet will attract more pins as it has more number of turns of wire on it and thus a stronger electromagnet.

Question 17:

Your teacher has shown you the following activity.

Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire arc connected to a cell through a switch as shown in the Figure. The current is switched on and some pins are placed near the ends of the nail.