A cylindrical wire has length 40 cm, cross-sectional area 60 mm², and resistance 3.0 22. The wire is connected across the terminals of a 12-volt battery. (a) (b) (c) Calculate the current in the wire, the power dissipated in the wire, the magnitude of electric field in the wire, and the resistivity of the wire. Include SI units with all answers. In 20 minutes, how much energy does the battery deliver to the wire, and how many electrons pass through the wire? (Again, include SI units where appropriate. Each electron has charge of magnitude 1.6 x 10-19 C.) If the length of this wire were increased while its cross-sectional area remains fixed, would the resistivity of the wire increase, decrease, or remain unchanged? Explain your answer qualitatively, without performing any calculations.
A cylindrical wire has length 40 cm, cross-sectional area 60 mm², and resistance 3.0 22. The wire is connected across the terminals of a 12-volt battery. (a) (b) (c) Calculate the current in the wire, the power dissipated in the wire, the magnitude of electric field in the wire, and the resistivity of the wire. Include SI units with all answers. In 20 minutes, how much energy does the battery deliver to the wire, and how many electrons pass through the wire? (Again, include SI units where appropriate. Each electron has charge of magnitude 1.6 x 10-19 C.) If the length of this wire were increased while its cross-sectional area remains fixed, would the resistivity of the wire increase, decrease, or remain unchanged? Explain your answer qualitatively, without performing any calculations.
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter12: Electronic Control Devices
Section: Chapter Questions
Problem 14RQ
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