A heater is made by a 1-m-long, 0.50-mm-diameter nichrome wire. When the wire is connected to a 1.5 V battery, calculate: (a) what is the current in the wire? (b) What is the power of the heater? TABLE 22.1 Resistivity of materials Resistivity (N•m) Material Copper 1.7 x 10 8 Tungsten (20°C) 5.6 X 10-8 Tungsten (1500°C) 5.0 x 10-7 Iron 9.7 × 108 Nichrome 1.5 X 10-6 Seawater 0.22 Blood (average) 1.6 Muscle 13 Fat 25 Pure water 2.4 X 10 Cell membrane 3.6 X 107
A heater is made by a 1-m-long, 0.50-mm-diameter nichrome wire. When the wire is connected to a 1.5 V battery, calculate: (a) what is the current in the wire? (b) What is the power of the heater? TABLE 22.1 Resistivity of materials Resistivity (N•m) Material Copper 1.7 x 10 8 Tungsten (20°C) 5.6 X 10-8 Tungsten (1500°C) 5.0 x 10-7 Iron 9.7 × 108 Nichrome 1.5 X 10-6 Seawater 0.22 Blood (average) 1.6 Muscle 13 Fat 25 Pure water 2.4 X 10 Cell membrane 3.6 X 107
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Transcribed Image Text:A heater is made by a 1-m-long, 0.50-mm-diameter nichrome wire. When the wire is connected
to a 1.5 V battery, calculate: (a) what is the current in the wire? (b) What is the power of the
heater?
TABLE 22.1 Resistivity of materials
Resistivity
(Ω. m)
Material
Copper
1.7 X 10 8
Tungsten (20°C)
5.6 X 10-8
Tungsten (1500°C)
5.0 x 10-7
Iron
9.7 X 10 8
Nichrome
1.5 X 106
Seawater
0.22
Blood (average)
1.6
Muscle
13
Fat
25
Pure water
2.4 X 10
Cell membrane
3.6 X 107
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