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Question
Fill in the blank
In a torch we use ______ as the source of electricity.
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Solution
In a torch we use dry cell as the source of electricity.
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RELATED QUESTIONS
Select the correct alternative
In a torch, the source of electricity is
Primary cells are used in mobile phones.
Assertion (A): Primary cells can not be recharged, they can be used only once.
Reason (R): In vehicles, we use primary cells.
What is meant by a battery or collection of cells?
______ cell is used to operate devices such as mobile phones, computers, and emergency lights.
A battery is a group of ______.
Match the following
| 1. | Dry cells | a. | Reversible |
| 2. | Electrolyte | b. | Opens or closes the circuit |
| 3. | Switch | c. | Solution |
| 4. | Secondary cell | d. | Torches |
Define electric cell. What is the direction of the electric current in a cell?
When the chemicals in the electric cell are used up, the electric cell stops producing electricity. The electric cell is then replaced with a new one. In case of rechargeable batteries (such as the type used in mobile phones, camera and inverters), they are used again and again. How?
Figure A and B, show a bulb connected to a cell in two different ways.
- What will be the direction of the current through the bulb in both the cases. (Q to P or P to Q)
- Will the bulb glow in both the cases?
- Does the brightness of the glowing bulb depend on the direction of current through it?
