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Author Question: An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal ... (Read 107 times)

jhjkgdfhk

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on: Aug 6, 2020

Question 1

A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45Ω. What is the resistivity of the material used to make the wire?

◦
5.6 × 10−7Ω⋅ m

◦
1.2 × 10−7Ω⋅ m

◦
1.8 × 10−7Ω⋅ m

◦
2.3 × 10−7Ω⋅ m

◦
7.1 × 10−7Ω⋅ m


Question 2

An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J)

◦
0.94 Ω

◦
0.81 Ω

◦
0.58 Ω

◦
0.69 Ω

◦
1.5 Ω
Physics for Scientists and Engineers ¦ Serway, Jewett ¦ 9th Edition
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Marked as best answer by jhjkgdfhk on Aug 6, 2020

potomatos

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Reply #1 on: Aug 6, 2020
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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jhjkgdfhk

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Reply 2 on: Aug 6, 2020
Excellent

brbarasa

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Reply 3 on: Yesterday
Gracias!

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