A 520-Ω resistor is connected to a variable-voltage power supply. (a) What voltage is necessary to cause a current of 0.4 A in the resistor? (b) What current flows in the resistor when the voltage is 21 V?

A 520-Ω resistor is connected to a variable-voltage power supply. (a) What voltage is necessary to cause a current of 0.4 A in the resistor? (b) What current flows in the resistor when the voltage is 21 V?

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter7: Electricity

Section: Chapter Questions

Problem 12P

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

Question

A 520-Ω resistor is connected to a variable-voltage power supply.

(a) What voltage is necessary to cause a current of

0.4 A in the resistor?

(b) What current flows in the resistor when the voltage is

21 V?

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