At 20°C, the carbon resistor in an electric circuit connected to a 7.3-V battery has a resistance of 2.8 x 102 . What is the current in the circuit when the temperature of the carbon rises to 75°C? mA

At 20°C, the carbon resistor in an electric circuit connected to a 7.3-V battery has a resistance of 2.8 x 102 . What is the current in the circuit when the temperature of the carbon rises to 75°C? mA

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 67PQ

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Question

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At 20°C, the carbon resistor in an electric circuit connected to a 7.3-V battery has a resistance of 2.8 x 102 . What is the current in the circuit when the temperature of the
carbon rises to 75°C?
mA

Expert Solution

Step 1

Given data,

initial temperature T₁ = 20^oC

Final temperature T₂ = 75^oC

Resistance at 20^oC is R₁ = 2.8x10² $Ω$

Battery voltage V = 7.3V

from Ohm's law we know that, if a resistor R is connected to a battery with voltage V then current through the resistor r is

$I = \frac{V}{R}$

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