Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 25, Problem 10P
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Is it possible to connect a group of resistors of value R in such a waythat the equivalent resistance is less than R? If so, give a specificexample
The temperature coefficient of a certain conducting material is 4.78 × 10-3 (°C)-1. (a) At what temperature would the resistance be 3 times the resistance at 20.0°C? (Use 20.0°C as the reference point in
ρ-ρ0=ρ0α(T-T0).) (b) Does this temperature hold for all copper conductors, regardless of shape or size?
Calculate the ratio of the resistance of 20.0 m of copper wire 1.8 mm in diameter to 10.0 m of aluminum wire 2.0 mm in diameter, (i.e. RCu/RAl =?)
Chapter 25 Solutions
Physics for Scientists and Engineers
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- Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew = 2R0) while the voltage is adjusted such that the current is constant, what are the ratios (a) Pnew/P0 and (b) Vnew/V0? If, instead, the resistance is held constant while Pnew = 2P0, what are the ratios (c) Vnew/V0, and (d) Inew/I0?arrow_forwardTwo wires have the same resistance and radius. If the wires are made of silver and iron with resistivities respectively of 1.59 ✕ 10−8 Ω · m and 10.0 ✕ 10−8 Ω · m, determine the ratio of their lengths. LAg LFe =arrow_forwardSuppose you wish to fabricate a uniform wire out of 1.00 gof copper. If the wire is to have a resistance R= 0.500Ω, andif all the copper is to be used, what will be (a) the length and(b) the diameter of the wire?arrow_forward
- A given copper wire has a resistance of 5.00 Ω at 20.0°C whilea tungsten wire of the same diameter has a resistance of 4.75 Ωat 20.0°C. At what temperature will the two wires have thesame resistance?arrow_forwardAlthough caution must be used in applying ρ = ρ0(1 + αΔT) and R = R0(1 + αΔT) for temperature changes greater than 100 °C , for tungsten, the equations work reasonably well for very large temperature changes. A tungsten filament at 20 °C has a resistance of 0.350 Ω . What would the resistance be if the temperature is increased to 2850 °C ?arrow_forwardA person with body resistance between his hands of 10.0 kΩ accidentally grasps the terminals of a 20.0-kV power supply. (Do NOT do this!) If the internal resistance of the power supply is 2000Ω , what is the current through his body?arrow_forward
- Suppose a n electrical wire is replaced with one having every linear dimension doubled (i.e., the length and radius h ave twice their original values). Does the wire now h ave (a) more resistance, (b) less resistance, o r (c) the same resistance than before?arrow_forwardThe quantity of charge through a conductor is modeled as: q(t)=at4+bt+c --> I(t) = 4 a t^3 + b If a = 5.02C/s4, and b = -4.36C/s, and c = 1.75μC, then what is the current, in amperes, at t=1.45s?arrow_forwardOf what material is a resistor made if its resistance is 40.0% greater at 100ºC than at 20.0ºC ?arrow_forward
- Why is the current in an incandescent bulb greater immediately after it is turned on than it is a few moments later? (That’s why bulbs usually burn out just as they are being turned on.)arrow_forwardIf the 0.100-mm diameter tungsten filament in a light bulb is to have a resistance of 0.200Ω at 20.0ºC, how long should it be?arrow_forwarda wire of uniform cross-section has a resistance of R. What would be the resistance of a similar wire, made of the same material, but twice as long and of twice the diameter?arrow_forward
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