define the following rheostat
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Answer:
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is the meaning ok....
Explanation:
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Answer:
All electronic appliances work on electric circuits - paths through which electricity/electric current can flow, with any circuit having some level of electrical resistance. Electrical resistance is nothing but the intrinsic property of the electric circuit to resist the flow of electric current. A rheostat is a variable resistor, or an adjustable resistance; placing it in any circuit allows you to control the resistance - and by extension, the current itself! Sometimes, a variable resistor or rheostat is referred to as a potentiometer and used interchangeably in day-to-day language.
Representational Drawing Of A Rheostat
Drawing Of A Rheostat
Charles Wheatstone, a British inventor/scientist, is often credited with developing the rheostat during the 19th century. In its simplest version, it is found as a long tube with coiled wires around it and an adjustable slider. When placed in an electric circuit, it has to receive & pass current - usually done through two terminals, with one terminal in the slider/adjustable contact and the other connected to the main circuit.
Now, if you pictured that correctly, that means the current has to flow through the coiled wires of the rheostat if it is going to flow at all! So, how is the resistance adjustable you may ask? Since one end of the rheostat is fixed to the main circuit, the other end (slider) can adjust the length of coiled wire the current has to travel through. The more coiled wire the current has to pass through, the more resistance it will face since the resistance exists in the coiled wire besides the existing circuit.
If this sounds confusing, picture driving through an underground tunnel with winds that are 200 miles per hour. Would you face more resistance in the overall journey if you started at the entrance, or if you started near the end of the tunnel? By reducing the distance you (electric current) travel, you can face less wind interference (electrical resistance). This is the basic concept behind the rheostat.