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

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Chapter1: Units, Trigonometry. And Vectors
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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.
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?
Transcribed Image Text:_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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