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Example 1. A 6 m long wire made from analloy, nichrome, is shaped into a coil andgiven for producing heat. It has a resistanceof 22 ohms. Can we get more heat if thewire is cut into half of its original lengthand shaped into a coil? For getting energy,the two ends of the wire are connected to asource with a potentialdifference of 220V.

Answer»

given: resistance 24 ohm,potential difference =220 VA. coil of whole wire. p=V²/R =(220)²/24 =201 watts

B. coil of half length wire p=V²/R =(220)²/12 =403 watts

this means that more heat will be obtained after cutting the wire into half



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