Welcome To My School Study
Do You Know
1. Battery (Combination of Cells)
A battery is formed when two or more cells are connected together to provide more electrical energy.
Understanding it:
A single cell gives limited power, but combining cells increases voltage and energy supply.
Where used:
- Torch (flashlight)
- Remote control
- Inverters and power systems
Example:
A TV remote usually works with two cells placed together, forming a battery.
2. Wire behaves like a Magnet (Magnetic Effect of Current)
When electric current flows through a wire, it produces a magnetic field around it, so the wire behaves like a magnet.
How it works:
Moving electric charges create a magnetic effect.
Result:
- The wire can attract small magnetic objects
- It can act like an electromagnet when coiled
Example:
Current-carrying wires are used in electric motors and cranes.
3. Electric Fuse (Safety Device)
An electric fuse is used to protect electrical circuits from damage caused by excess current.
How it works:
- It contains a thin wire that melts when current becomes too high
- This breaks the circuit and stops the flow of electricity
Why important:
Prevents short circuits, fire, and damage to appliances.
Example:
Fuses are used in household wiring and electrical devices.
4. Nichrome (Heating Element Material)
The heating element of an electric iron is made of nichrome, an alloy of nickel and chromium.
Why nichrome is used:
- High resistance (produces heat easily)
- High melting point (does not melt quickly)
- Durable and long-lasting
Example:
Used in electric iron, heater, toaster, and geyser.
5. Discovery of Magnetic Effect – Hans Christian Oersted
The magnetic effect of electric current was discovered by Hans Christian Oersted in 1820.
What he observed:
A compass needle placed near a current-carrying wire got deflected.
Conclusion:
Electric current produces a magnetic field.
Importance:
This discovery led to inventions like electromagnets, electric motors, and generators.