Current and Resistance
43 videos • 24,261 views • by WNY Tutor
1
A rectangular block of copper has sides of length 10 cm, 20 cm, and 40 cm. If the block is connected
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2
An aluminum wire having a cross-sectional area
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3
Aluminum and copper wires of equal length are found to have the same resistance. What is the ratio o
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4
Suppose you wish to fabricate a uniform wire out of 1.00 g of copper.
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5
A wire 3.00 m long and 0.450 mm^2 in cross-sectional area
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6
A given copper wire has a resistance of 5.00 Ω at 20.0°C while a tungsten wire of the same diameter
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7
In the Bohr model of the hydrogen atom, an electron in the lowest energy state moves at a speed
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8
A length of aluminum wire has a resistance of 30.0 Ω at 20.0°C. When the wire is warmed in an oven a
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9
Gold is the most ductile of all metals. For example, one gram of gold can be drawn into a wire 2.40
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10
A high-voltage transmission line with a resistance of 0.31 Ω/km carries a current of 1000 A. The lin
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11
What is the current in a wire of radius R = 3.40 mm if the magnitude of the current density is given
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12
A wire with a resistance of 6.0 Ω is drawn out through a die so that its new length is three times i
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13
A heating element is made by maintaining a potential difference of 75.0 V across the length of a Nic
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14
If 3.25 X 10^-3 kg of gold is deposited on the negative electrode of an electrolytic cell in a
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15
If electrical energy costs $0.12 per kilowatt-hour, how much does it cost to (a) burn a 100-W lightb
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16
Batteries are rated in terms of ampere-hours (A • h). For example, a battery that can deliver a curr
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17
A 34.5-m length of copper wire at 20.0°C has a radius of 0.25 mm. If a potential difference of 9.0 V
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18
An electric utility company supplies a customer’s house from the main power lines (120 V) with two c
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19
A resistor is constructed by forming a material of resistivity 3.5 X 10^5 Ω • m into the shape of a
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20
Suppose a wire made of an unknown alloy and having a temperature of 20.0°C carries a current of 0.45
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21
The heating element of a coffee maker operates at 120v
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22
Nichrome wire of cross sectional radius
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23
A 200 km long high voltage transmission line 2.0 cm in diameter
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24
Copper and aluminum are being considered for a high-voltage transmission
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25
an experiment is conducted to measure the electrical resistivity of nichrome
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26
A potential difference of 1.20 v will be applied to a
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27
wire c and wires are made from different materials
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28
The figure shows wire section 1 of diameter
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29
At what temperature will aluminum have a resistivity
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30
An isolated conducting sphere has a 10 cm radius
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31
A charged belt 50 cm wide
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32
Near earth the density of protons in the solar wind
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33
How long does it take electrons to get from a car battery to the starting motor
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34
A certain wire has a resistance r. what is the resistance of a second wire
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35
Two conductors are made of the same material and have the same length
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36
A block in the shape of a rectangular solid has a cross-sectional area
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37
A 120 v potential difference is applied to a space heater
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38
An aluminum rod with a square cross section is
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39
A metal wire of resistance r is cut into
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40
The current supplied by a battery in a portable device
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41
While taking photographs in death valley
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42
A 50.0 g sample of a conducting material
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43
The magnitude j of the current density
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