Science, asked by diapereira1111, 4 days ago

Answer the following in not more than 20 words.
1. What do you need to apply across a bulb to cause a current to flow through it?
2. Why does a bulb get warmer than the wires that connect it to a battery?
3. A magnetic needle gets deflected when brought near a current-carrying conductor. What does this show?
4. What happens when you place an iron nail in a current-carrying coil?
5. Why do we use a soft iron core in an electromagnet?
6. Name four devices that use the heating effect of electric current.
7. Mention four applications of electromagnets.

Answers

Answered by Aʙʜɪɪ69

Explanation:

Ans 1 - We need to apply voltage from a battery across a bulb to cause a current to flow through it.

Ans 2 - Bulb contains a filament which is made up of tungsten. Tungsten has high resistivity, greater than that of the copper which makes up the wires.

Ans 3 - It shows that the the current carrying conductor is a good conductor of electricity.

Ans 4 - When you place an iron nail in current carrying coil, it gets magnetized temporarily.

Ans 5 - Soft iron is used because it loses its magnetism as soon as the current stops flowing.

Ans 6 - Electric heater.

Electric iron.

Microwave oven.

Induction cooker.

Ans 7 - Motors and generators.

Transformers.

Relays.

Electric bells and buzzers.

Answered by Krissh13

Answer:

Ans 1 - We need to apply voltage from a battery across a bulb to cause a current to flow through it.

Ans 2 - Bulb contains a filament which is made up of tungsten. Tungsten has high resistivity, greater than that of the copper which makes up the wires.

Ans 3 - It shows that the the current carrying conductor is a good conductor of electricity.

Ans 4 - When you place an iron nail in current carrying coil, it gets magnetized temporarily.

Ans 5 - Soft iron is used because it loses its magnetism as soon as the current stops flowing.

Ans 6 - Electric heater.