Fuse
| Q. What is fuse? Definition: The thin wire which burn when excesse electricity flow through circuit and make circuit open that's why electric equipment saved from burns, is called fuse. It is made by alloy of Sn(Tin) and Pb (lead). |
Q. How suitable fuse selected? → Finding current (I = ) in circuit then the fuse of little more capacity is selected. |
Neutral wire:-The wire which carry electricity from equimpment (load) to source is calle neutral wire.
Earthing wire:- The wire which transfer leaked electricity on equipment (load) to the ground is called earthing wire. Therefor no electric shock when we touch equipment.
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Q. Fuse always connected in live wire, why? → Electricity always flow through live wire. If we connect fuse in live wire, then when fuse is fused there is no possibility of electric shock when we touch it. Therefore fuse is connected to live wire. Q. Cupper doesn't used as fuse wire, why? → Cupper has high melting point and less resistance. As excess electricity flow through circuit, cupper doesn't melt to made open circuit which may cause damage of equipment.Therefor switch always connect to live wire. Q. Switch connect to live wire, why? → If we connect fuse to live wire then when fuse is off there is no current in equipment so that no possibility of electric shock. Therefor switch connect to live wire. |
Q. At home electric circuit, why fuse is necessary ? → Some times excess electricity flow through circuit which may cause firing or damage or accident. To save from all these, fuse is necessary for home circuit. Q. At home electric circuit, fuse is necessary to per floor and per room, why? → If a fuse of certain floor or room is fused, then electricity flow of other floor or room circuit don't cutoff. So that at every floor and room there is different fuse. Q. Electric wire and equipment are not placed at water leak place or cooled place, why? → Because if so then electricity leaked and that may cause electric shock. So that electric wire and equipment are place at dry place. Q. Birds can sit on nacked electric wire but when we touch give electric shock, why? → Birds sit on single wire which at same potential. So birds can sit easily. When we touch electric current flow through our body to ground because of complete of circuit.Therefor give electric shock. |
The electric energy transfer by the equipment to another type of energy per hour is called electricity consumption.
By the formula, Electricity consumption = P × n × t
Q. What is the power of electric equipment?
→ Electric energy consume by electric equipment per second is called power of equipment.
Q. What is one kilowatt hour (1unit) electricity?
→ Electricity sonsumed by equipment of power 1KW in one hour is called one kilowatt hour (1unit) electricity.
→ Heating effect of electricity The Process of converting electric energy to heat energy is called heating effect of electricity. Q. What is the heating element? → It is a coil used in heater which converts electric energy to heat energy is called heating element. It is made of Nichrome. Nichrome is an alloy of Nickel and cromiam. Q. Nichrome is used in heater as heating element, why? Q. The heater in which nichrome is used as heating element is more preferabl,why?
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Lighting effect of electricity The process of converting electric energy to light energy is called lighting effect of electricity. Q. What is Filament? → It is a thin wire used in filament bulb made of Tungsten metal which convert electric energy to light energy. Q. Tungsten is used as filament, why?
Q. Inert gas is filled in filament bulb or filament buld is made vaccum, why? → Filament (Tungsten) fused by reacting with oxygen. To remove this weakness bulb are filled with inert gas or made vaccum. Q. Filament is made thin and coiled, why? → To put excess of filament wire in bulb, the filament is made thin and coiled. Q. Filament bulb is made round, give reason? → To distribute light all around of it, bulbs are made round. Q. Filament wire produce light but other wire in bulb don't produce light, give reason? → Filament wire has high resistance made thin. So that at high temperature it produce light but other wire has low resistance and don't produce light. |
| Difference between filament bulb and Fluorecent bulb | |
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| 1. It is filled with inert gas or made vaccum | 1. It is filled with mercur vapour and fluorecent powder |
| 2. After heating filament, it produce light | 2. Vapour of mercury produce Ultraviolet ray which made powder to glow |
| 3. It produce 10% light energy and 90% heat energy. | 3. It produce 30% light energy and 70% heat energy |
| 4. It works for 1000 hour | 4. It works for 3000 hour |
| Magnetic effect of electricity | |
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Q. What is magnetic flux? → Magnetic line of force per unit area is called magnetic flux. Q. What is electric magnet? → Magnet made with the help of electricicty is called electric magnet. Q. Significance of electric magnet
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