A wooden skewer and a piece of wire have the same dimensions: a length of 0.20 m and a cross-sectional area of 3×10-6 m?. The resistivity of the wood is 3×10'm and the resistivity of the metal is 1.5×10-8 fm. (a) What is the resistance of each object to the flow of electric current? (b) If a potential difference of 12 V exists between the ends of each object, find the current flowing through each. (c) The two objects are connected in parallel between a 12 V supply and ground. Find the resistance of the combination. (d) If you were forced to touch one of these objects in this circuit, which would you choose? Why?

A wooden skewer and a piece of wire have the same dimensions: a length of 0.20 m and a cross-sectional area of 3×10-6 m?. The resistivity of the wood is 3×10'm and the resistivity of the metal is 1.5×10-8 fm. (a) What is the resistance of each object to the flow of electric current? (b) If a potential difference of 12 V exists between the ends of each object, find the current flowing through each. (c) The two objects are connected in parallel between a 12 V supply and ground. Find the resistance of the combination. (d) If you were forced to touch one of these objects in this circuit, which would you choose? Why?

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)...

See similar textbooks

Similar questions

Resistance depends on the size and shape of a conductor. We expect a long wire to have higher resistance than a short one (everything else being the same) and a thicker wire to have a lower resistance than a thin one. Resistance also depends on the intrinsic property of the conductor called the resistivity. If the resistivity of a particular wire is 70.26x10-8 Ω ⋅ m, the wire is 44.47mm in length, and the radius of the diameter of the wire is 1.95m, what is the resistance of the wire in units of Ohms (Ω)?
A copper wire has a resistance of 15 Ω at some temperature. An aluminum wire has 3 times the length and 5 times the radius of the copper wire. The resistivity of copper is 0.7 times that of aluminum. What is the resistance, in Ω, of the aluminum wire at the same temperature? Round your answer to 0 decimal places.
A 30.0 m long extension cord is made from two #19 gauge copper wires. (a) What is the resistance of the wire at 200C? The diameter of the copper wire is 0.912 mm.(b) If the copper wire is replaced by an Aluminium wire of the same length, what is the diameter so that the new wire has a resistance no greater than the old?
There is a potential difference of 0.90 V between the ends of a 20 cm long graphite rod that has a cross-sectional area of 1.8 mm2. The resistivity of graphite is 7.5 x 10-6 2-m. (a) Find the resistance of the rod. (b) Find the current. (c) Find the electric field inside the rod.
Suppose you're using a copper wire that has a radius of 0.5 mm, is 3.8 m long, and has a resistivity p=1.7 x 10 8 N- m. What is the resistance of the wire in Ohms?
I have a 150 m copper wire that has a resistance of 80.0 (I really do). Assuming the resistivity of copper to be 1.68 x 10^-8 ohm, calculate the thickness (diameter) of the wire.
A common flashlight bulb is rated at 0.34 A and 2.3 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 1.0 2, what is the temperature of the filament when the bulb is on? The temperature coefficient of resistivity is 3.7 x 10-3 K-1 for the filament material.
are made of the same metal. 7) wires 1 and 2 wire 2 has twice the length and twice the diameter of wire 1. What are the ratios (a) Q₂/Q² of the resistivities and (b) R.2/121 of the resistance of the two wires? A) P₁/P₁ = 1, 1₂/1²₁=0.5 13) P₂/p₁ = 1, 82₂/124₁ =0.25 C) P₁/P₁ = 0.5² h₂/1²₁=0.5 D) P₁/P₁ = 0.25, 1₂₁/1²₁=0.5 2 र
A particular wire has a resistivity of 3.3 x 10-8 · m and a cross-sectional area of 3.7 x 10-6 m². A length of this wire is to be used as a resistor that will develop 51 W of power when connected across a 20-V battery. What length of wire is required? km
An aluminum rod with a square cross section is 1.8 m long and 6.2 mm on edge. (a) What is the resistance between its ends? (b) What must be the diameter of a cylindrical copper rod of length 1.8 m if its resistance is to be the same as that of the aluminum rod? The resistivity of aluminum is 2.75 x 108 Q-m and the resistivity of copper is 1.69 x 108 Q:m. (a) Number i Units (b) Number i Units