Question

A.
Answer
the
following
in
not
more
than
20
words
,
Electricity
Exercises
1. What do you need to apply across a bulb to cause a current to fou through it?
2. Why does a bulb get warmer than the wires that connect to a batter?
this shoul?
3. A magnetic needle sets deflected when brought near a current carrying conductor What does
4. What happens when you place an iron nail in a current-carrying can
5. Why do we use a soft fron ore in an electromagnet?
6. Name four devices that use the heating effect of electric current.
7. Mention four applications of electromagnets,
B. Answer the following in not more than 40 words,
1. What is a circuit diagram Draw the circuit diagram of a torch which works on three cells.
2. Identify the following symbols. Also mark the positiwe and negative terminals in the symbol for
the cell.
the current?
3. How is the heat produced by an electric current related to resistance and the magnitude of
4. Why is a long and thin tungsten filament used in a bulte
5. Mention to problems associated with the heating effect of electric current
6. What is an electromagnet? Mention two properties of an electromagnet.
C. Answer the following in not more than 100 words.
1. What is electrical resistance On what does the resistance of a piece of material depend? How
does resistance affect current?
2. What is a fuse? How does it work?
3. Explain with the help of a diagram the construction and working of an electric bell.
D. Fill in the blarks
1. The greater the ... across a device, the greater is the current through it.
2. The connections between components are represented by
3. A long wire has ... resistance than a short wire.
4. An ..... is a condition in which a wire carries a current that is more than what is safe.
5. A closely wound length di wise is called a -----
3. Choose the correct option
1. The magnitude of a current flowing through a dertice depends
bj only on its resistance
(a) only on the voltage across it
c) on its resistance and the voltage across it none of these
2. Nichrome is used for making
b) fuse wires
a) the filaments of bulbs
colis for electromagnets
I heater elements
3. To make a battery of 9 volts. how many 1.5-V cells are needed?
5​

Answer 1

Answer:

Explanation:

Ok nice question