Working of an Electric iron Explained with 3D Animation

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Transcript

00:00An electric iron is a common household appliances in our daily life.

00:04An electric iron convert electrical energy into heat energy.

00:09In this video I will explain the working of an electric iron.

00:13Inside parts of electric iron are heating element, thermostat, thermal fuse, and neon bulb.

00:22The heating element is the heart of an electric iron.

00:25The heating element coils are generally made by the nichrome material.

00:29It has high resistance and it can sustain in high temperatures.

00:34If you connect an AC supply directly to the coil, it will start getting heat.

00:40The magnesium oxide powder is used to insulate this coil from the metal case.

00:46When the current flows through a heating element coil continuously,

00:50the temperature of the coil will become uncontrollable.

00:54Here is the importance of a thermostat.

00:56The thermostat is used to sense the base plate temperature

01:00and switch off the current flow to the heating element coil.

01:03Thermostat has input terminal, output terminal, contact spring, and a bimetallic strip.

01:10The bimetallic strip consists of two strips of different metals

01:14which expand at different rates as they are heated.

01:17It is used to sense the temperature of the electric iron.

01:21When the base plate temperature increases,

01:23the bimetallic strip bend and pushes up the contact spring.

01:27Because of this pushing force and spring tension,

01:30contact points disconnect and stop the current flow.

01:34When base plate temperature decreases, the bimetallic strip comes back to its normal position

01:39and contact points connect again for current flow.

01:43Phase line connected to inputs terminal of the thermostat

01:47and the neutral line connected to the first terminal of the heating element.

01:51Thermal fuse connected between the output terminal of the thermostat

01:55and the second terminal of the heating element.

01:57Neon bulb connected to both ends of the heating element

02:00and earth line connected to the body of electric iron.

02:04When you switch on the electric iron while the control knob is in a high position,

02:09current flow to the coil through the thermostat without any interruption.

02:13When the coil temperature reaches above 200 degrees Celsius,

02:17the thermostat contact points disconnect and stop the current flow.

02:22When the temperature reaches below 150 degrees Celsius,

02:26contact points connect again and current flow to the coil.

02:30When you rotate the knob to low temperature,

02:33knob press down the spring and make changes in spring tension

02:36and disconnects the contact points early than before.

02:40So iron box temperature doesn't go higher than that particular temperature

02:45and keep the iron box of a low temperature.

02:48The thermal fuse is used to protect the coil and avoid a firing.

02:52When the thermostat fails and overheats the iron box,

02:55thermal fuse blow out and stop the current flow to coil.

03:00Hope you understand the working of an electric iron and its internal parts.

03:05Thanks for watching like, comment, share and subscribe.

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