A heating element on an electric stove contains a wire that is 1.1 m long and has a cross-sectional area of 3.1 × 10−6 m2. This wire is contained in an electrically insulating casing surrounded by a metal casing. When electric current flows through the wire, it heats up, and subsequently the insulating and metal casings heat up as well. When the coil is at a temperature of 320 oC, the material the wire is composed of has a resistivity of 6.8 × 10−5 Ωm and a temperature coefficient of resistivity of 2.0 × 10−3 oC−1. (a) What is the resistance of the wire when it is at a temperature of 320 oC? (b) What is the resistance of the wire when it is at a temperature of 420 oC? (c) What is the resistance of the wire when it is at room temperature (25 oC)?
A heating element on an electric stove contains a wire that is 1.1 m long and has a cross-sectional area of 3.1 × 10−6 m2. This wire is contained in an electrically insulating casing surrounded by a metal casing. When electric current flows through the wire, it heats up, and subsequently the insulating and metal casings heat up as well. When the coil is at a temperature of 320 oC, the material the wire is composed of has a resistivity of 6.8 × 10−5 Ωm and a temperature coefficient of resistivity of 2.0 × 10−3 oC−1.
(a) What is the resistance of the wire when it is at a temperature of 320 oC?
(b) What is the resistance of the wire when it is at a temperature of 420 oC?
(c) What is the resistance of the wire when it is at room temperature (25 oC)?
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