Advertisements
Advertisements
Question
Give a reason for the following.
One should not use an umbrella while crossing an open field during thunderstorm.
Advertisements
Solution
Reason:
- Carrying an umbrella is not advisable during a thunderstorm.
- As the rod of the umbrella and its supporting wires are made up of metals.
- Thus during a thunderstorm, the conducting object should be avoided.
APPEARS IN
RELATED QUESTIONS
Three resistors of resistances R1 , R2 and R3 are connected (i) in series, and (ii) in parallel. Write expressions for the equivalent resistance of the combination in each case.
One unit of coulomb is charge of approximately ______ protons or electrons.
Match the following
| 1. | Cell | used to open or close a circuit |
| 2. | Switch | safety device used in electric circuit |
| 3. | Circuit | A complete path for the flow of an electric current |
| 4. | Miniature circuit Breaker | Reset by hand, circuit becomes complete once again |
| 5. | Fuse | A device which converts chemical energy into electrical energy |
Explain the construction and working of an Telephone.
Water can conduct electricity.
A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure. The current recorded in the ammeter will be
![]() |
![]() |
![]() |
| (i) | (ii) | (iii) |
Boojho made the circuit given in the figure and observed that the bulb did not glow. On Paheli’s suggestion he added one more cell in the circuit. The bulb now glows. Explain.

Which of the following precautions need not be taken while using electric gadgets/appliances/circuit?
Which property of a conducting wire is utilised in making electric fuse?
A tiny particle that rotates around the nucleus of an atom is ______.



