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Testing the heating effect of current:
Two nails are placed on a thermocol and are connected with a cell and a switch. A nichrome wire of \(10\ cm\) long is tied between the nails. The nichrome wire can be seen in an electric heater and electric repair shops.
When the switch is in the 'OFF' state, no current flows through the circuit. So, when the wire is touched at this time, nothing is felt. But when the switch is turned 'ON', the electric current flows through the circuit making the wire hot. This is called as the heating effect of the electric current.
Important!
If the switch is kept in the 'ON' position for a long time, the cell may become weak and gets worn out quickly. So, never keep the switch in the 'ON' state for a long time if it is not in use.
Heating effect in appliances:
Many electrical appliances use this heating effect to make our work easier.
Example:
Electric room heater
Geyser
Electric cooker
In all these appliances, a coil of wire called an element is present. When these appliances are switched on, electric current flows through the circuit. This makes the element in the appliances to give out heat.
Element in the appliance
Properties of the element:
Compact Fluorescent Lamps:
Compact Fluorescent Lamp
Light Emitting Diode:
Light Emitting Diode (LED) bulbs are more efficient than any other bulbs. They consume less amount of electricity than CFLs, incandescent bulbs, and fluorescent tubes. Hence, LEDs are preferred more. It is good to use electrical appliances that are electricity efficient.
ISI mark:
Bureau of Indian Standards in New Delhi gives an assurance of conformity to the specifications given on the products called Indian Standards Institution (ISI) mark. It is a Standard Mark on products. It is always suggested to use products having ISI mark.
Reference:
Bureau of Indian Standards for ISI mark
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