Which appliance is made on the basis of magnetic effect of electric current –
- (a) Electric bulb
- (b) Electric bell
- (c) Electric iron
- (d) Soldering iron
Fill in the blanks –
- In the symbol of electric cell, the longer line represents the ——- terminal.
- Combination of two or more electric cells is called ————–.
- Electric bulb shows —————— effect of electric current.
- In loudspeakers —————— effect of electric current is used.
- Melting point of fuse wire is very ————–.
- In the symbol of electric cell, the longer line represents the positive terminal.
- Combination of two or more electric cells is called a battery.
- Electric bulb shows the heating effect of electric current.
- In loudspeakers, the magnetic effect of electric current is used.
- The melting point of fuse wire is very low.
Answer the following questions –
- What are the important components necessary for an electric circuit?
Important Components for an Electric Circuit:
Electric source , Conductors ,Switches,Loads ,Safety devices,Insulators .
- Explain the heating effect of electric current.
The heating effect of electric current is the phenomenon where electrical energy is converted into heat when current passes through a conductor. This occurs due to the resistance offered by the conductor. The resistance results in the generation of heat, causing the conductor to become hot. This principle is applied in devices like electric bulbs, heaters, and soldering irons.
- Write two uses of magnetic effect of electric current.
Electric Bells: Electric bells use the magnetic effect of electric current to attract an iron armature when the circuit is closed, causing the bell to ring.
Loudspeakers: Loudspeakers use the interaction of current with magnets to produce sound waves.
- Write three uses of an electromagnet.
Uses of Electromagnet:
- Electric Cranes: Electromagnets are used in cranes to lift heavy objects.
- Scrap Yards: Electromagnets are employed to separate iron from garbage in scrap yards.
- Electrical Devices: Electromagnets are used in various electrical devices such as electric motors, generators, and electric trains.
