_1. If wire has 1.25 x 1016 electrons flowing through itscross-section in one second, what is the current in thewire.2. How much current is flowing when 15 C pass aspecified point in 5 s?3. An electric motor winding uses 180 m of copperconductor with a cross-sectional area of 0.26 cm2. Findthe resistance of the electric winding at 20°C. Theresistivity of copper is 1.72 x 10-8 Q-m.4. What is the resistance of a lamp which allows 0.8 Acurrent when 110.0 V is applied to it?5. The heating element in a clothes dryer is rated at 5Kw and 220 V. How much current does it draw?6. A potential difference of 9 V is maintained across aconductor in a circuit. If the conductor has a resistanceof 10 ohms, how many electrons flow through theconductor's cross-section in 5 seconds?7. A piece of material with a square cross-sectionmeasuring 1 mm on each side has a length of 1 m.What is the resistance of this material if it were made ofaluminium? Fused quartz? Finally, calculate the currentthrough each piece of material if a potential differenceof 1 volt is applied over its length.8. An electrical device with a potential difference of 15V across its ends provides energy at a rate of 723 W.(a) What is its resistance? (b) What is the current in theresistor?

Given that,number of electron flowing per second, N=1.25×1016charge of 1 electron, q= 1.6×10-19…

Answered: _1. If wire has 1.25 x 1016 electrons…

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_1. If wire has 1.25 x 1016 electrons flowing through its cross-section in one second, what is the current in the wire.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 16P

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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

_1. If wire has 1.25 x 1016 electrons flowing through its
cross-section in one second, what is the current in the
wire.
2. How much current is flowing when 15 C pass a
specified point in 5 s?
3. An electric motor winding uses 180 m of copper
conductor with a cross-sectional area of 0.26 cm2. Find
the resistance of the electric winding at 20°C. The
resistivity of copper is 1.72 x 10-8 Q-m.
4. What is the resistance of a lamp which allows 0.8 A
current when 110.0 V is applied to it?
5. The heating element in a clothes dryer is rated at 5
Kw and 220 V. How much current does it draw?
6. A potential difference of 9 V is maintained across a
conductor in a circuit. If the conductor has a resistance
of 10 ohms, how many electrons flow through the
conductor's cross-section in 5 seconds?
7. A piece of material with a square cross-section
measuring 1 mm on each side has a length of 1 m.
What is the resistance of this material if it were made of
aluminium? Fused quartz? Finally, calculate the current
through each piece of material if a potential difference
of 1 volt is applied over its length.
8. An electrical device with a potential difference of 15
V across its ends provides energy at a rate of 723 W.
(a) What is its resistance? (b) What is the current in the
resistor?

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