Your car battery is dead, and your friends are helping you start your car with cheap jumper cables. One cable carries current from theircar to your car, and a second cable returns that current to their car. As you try to start your car, a current of 80.0 A flows through thecables to your car and back, and a voltage drop of 6.00 V appears across each cable. If you replace the cheap cables with cables havinghalf their electric resistance, what voltage drop will appear across each new cable if the current doesn't change?AV=i

Solution Given dataCurrent I=80AVoltage drop V=6.0VIf you replace the cheap cables with cables…

Answered: our car battery is dead, and your…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Similar questions

A capacitor with a capacitance of 3.5 μF is initially uncharged. It is connected in series with a switch of negligible resistance, a resistor with a resistance of 19 kΩ, and a battery that has a potential difference of 170 V. What is the charge Q, in microcoulombs, on the capacitor when the current in the resistor equals one half its maximum value.
120V series-wired ornamental lightbulbs, Figure 1. Suppose you have a string of 48bulbs, each one with a resistance of 8.00Ω. Assume the resistance of a bulb with itsfilament broken drops to zero. Suppose that a bulb becomes dangerously warm, sothat it could set something on fire, if it receives a power of 1.75 W. How many bulbscan fail before the string of lights becomes dangerous?
A 60W lightbulb in your house is left on for 25 minutes while you do some of your Foundations of Physics homework. A quick google tells you that the mains voltage in Australia is 230V. How many electrons pass through the lightbulb in that time?
A lightning rod on top of a building consists of an iron spike 1.5 m long with a circular crosssection of diameter 1.5 cm. During a lightning strike, the rod carries a current of 1000 A. What is the potential difference across the rod when this current flows? The resistivity of iron is 1.0 x 10-7 Ωm.
A 580 mm long tungsten wire, with a 0.048 mm diameter circular cross section, is wrapped around in the shape of a coil and used as a filament in an incandescent light bulb. When the light bulb is connected to a battery, a current of 0.536 A is measured through the filament. Tungsten has a resistivity of 4.9 x 10-8 Ohms x m. How many electrons pass through this filament in 5 seconds? What is the resistance of this filament? What is the voltage of the battery that would produce this current in the filament?
Electric current passing through a human body can be dangerous, even fatal, depending on the amount of current, the duration of the current, and the region of the body through which the current passes. However, currents less than about 0.5 mA are typically imperceptible. A current caused by a low potential difference typically travels through the outer layer of the skin. The resistance of the skin therefore determines how much current flows for a given potential difference. The resistance can be influenced by a number of factors, including whether the skin is wet or dry . For example, suppose an electric current of 89.0 µA follows a path through the thumb and index finger. When the skin is dry, the resistance along this path is 4.40 ✕ 105 Ω. What voltage (in V) is required for this current, in the case of dry skin? V When the skin is wet, the resistance is lowered to 1,950 Ω. What voltage (in V) is required for the same current, in the case of wet skin? V
Two resistances, R1 and R2, are connected in series across a 12-V battery. The current increases by 0.23 A when R2 is removed, leaving R1 connected across the battery. However, the current increases by just 0.13 A when R1 is removed, leaving R2 connected across the battery. Find (a) R1 and (b) R2.
a. An action potential propagates at 64 m/s down an axon that is 30cm long. How much energy is transmitted down the axon if the action potential has a maximum value of 75mV and the resistance is 20,000Ω. b. A 12V battery supplies 0.7mA of current for 4.8hours. How much charge has been transferred? c. The filament in the 100W light bulb has a resistance of 144Ω and is tungsten. It has a diameter of 0.03mm and has a resistivity of 5x10-7Ωm. How long should the filament be?

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