9. When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. Find the value of the resistance of the resister: (a) 5000 0 (b) 8000 (c) 0.80 (d) none of these

9. When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. Find the value of the resistance of the resister: (a) 5000 0 (b) 8000 (c) 0.80 (d) none of these

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 34PE: Assuming a constant temperature coefficient of resistivity, what is the maximum percent decrease in...

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

9. When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. Find the
value of the resistance of the resister:
(a) 50000
(b) 8000
(c) 0.80
(d) none of these

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