COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 18, Problem 4QAP
To determine
How do compare the resistiveties of the both material Aand B?
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You are working as an electrical engineer in a manufacturing plant for electrical fuse. In choosing an ideal fuse wire, the wire must have low melting point and high resistivity. 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 m2. The resistivity of the wood is 3×101m 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?
Aluminum and copper wires of equal length are found to have the same resistance. What is the
ratio of their radii?
Note: You need to use the concept of resistivity and find the resistivity of these two materials to
solve this problem. You can find a table of resistivity in your textbook or use the internet.
Chapter 18 Solutions
COLLEGE PHYSICS
Ch. 18 - Prob. 1QAPCh. 18 - Prob. 2QAPCh. 18 - Prob. 3QAPCh. 18 - Prob. 4QAPCh. 18 - Prob. 5QAPCh. 18 - Prob. 6QAPCh. 18 - Prob. 7QAPCh. 18 - Prob. 8QAPCh. 18 - Prob. 9QAPCh. 18 - Prob. 10QAP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a current of1 = 2.00 A is accidentally passed through a R=1.00 resistor rated at 1 W, what would be the most probable outcome? Is there anything that can be done to prevent such an accident?arrow_forwardA 0.900-V potential difference is maintained across a 1.50-m length of tungsten wire that has a cross-sectional area of 0.600 mm2. What is the current in the wire?arrow_forwardExplain why R=R0(1 + a?T) for the temperature variation of the resistance R of an object is not as accurate as P=P0(1 + a?T) which gives the temperature variation of resistivity P.arrow_forward
- Two conducting wires A and B of the same length and radius are connected across the same potential difference. Conductor A has twice the resistivity of conductor B. What is the ratio of the power delivered to A to the power delivered to B? (a) 2 (b) 2 (c) 1 (d) 12 (e)12arrow_forwardTaking R = 1.00 k and = 250 V in Figure P21.49, determine the direction and magnitude of the current in the horizontal wire between a and e. Figure P21.49arrow_forwardPure copper has a resistivity of 1.68 × 10−8 Ωm. Some accurate cubes of copper are prepared,and electrical measurements are made, for which current is passed across a pair of oppositefaces.a) Comparing a 2.5 cm cube and a 5 cm cube, which will have the higher conductance? Explain your answer.b) Given eight 1 cm cubes, how can they be stacked to get the highest and the lowest resistance between opposite faces of the stack? Calculate the resistance of each stack.arrow_forward
- 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)?arrow_forward1. In this lab you will be calculating the resistivity, you will first need to determine the cross sectional area (A) of each wire. If we consider a wire to be a long cylinder; then the cross sectional area would have a circular shape as shown by Figure 2 in the instructions. Use equation (5) to calculate the cross sectional area for each wire. Note: Write down the areas in scientific notation and have 7 digits. Material Diameter (m) Cross – Sectional Area (m²) 0.000408 A = 0.000713 A2 = Brass 0.000916 Az = 0.001170 A4 = Copper 0.000916 Ag = %3D Nichrome 0.000916 A, = Stainless Steel 0.000916 Ag = 2. A student Mei who is doing the experiment measures a voltage V = 0.094954 V and a current I = 1.0747 A, then she uses equation (2) to calculate the resistance R. What value does Mei determine for R? 3. Mei puts in her values and constructs a graph which gives her a slope of 0.0980244 She then uses equation (7) and the cross sectional area of A, (from the calculations on question #1) to…arrow_forwardA block of carbon, 1.0 cm by 2.0 cm by 5.0 cm, has a resistance of 0.015 Ω between its two smaller faces. What is the resistivity of carbon?arrow_forward
- 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.arrow_forwardTwo wires have the same length and the same resistance but are made up of different materials. The resistivities of these materials are 1.78 Ωm and 3.46 Ωm. Obtain the ratio of the smaller cross-sectional area to the greater cross-sectional area.arrow_forwardAn aluminum rod with a square cross-section is 2.6 m long and 5.3 mm on edge. (a) What is the resistance between its ends? (b) What must be the diameter of a cylindrical copper rod of length 2.6 m if its resistance is to be the same as that of the aluminum rod? The resistivity of aluminum is 2.75 × 10-8 Ω·m and the resistivity of copper is 1.69 × 10-8 Ω·m.arrow_forward
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