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4.
If 43.0 m of nichrome wire is to have a resistance of 10.0 Ω at 20°C, what diameter wire should be used?
_____mm
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- How does the resistance for copper and for silicon change with temperature? Why are the behaviors of these two materials different?2. Find the equivalent resistance of the following circuit, and the current and the voltage across each resistor. b. R = 6.0 0 E= 90 V R = 3.0 2 r- 0.25 23 R = 1.5 3. Water, specific heat capacity c = 4.186 joules/gram C, flows through an insulated plastic pipe at a flow rate of 16.0 grams/sec. The water enters the pipe at a temperature of 10 C and leaves at a temperature of 80 C. The water is heated by an electric heater in the middle of the pipe. What is the Power output of the electric heater?2. A resistor has a temperature coefficient of 0.0009/°C. If the resistor has a resistance of 450 2 at 27°C, what will its resistance be at 70°C?
- The resistivity of an ohmic material depends on ______. * 1 p A. Resistance B. Length of the conductor C. Cross-section Area of the conductor D. Nature of the material (composition) O A,B,&C OB & C O A & D O D26. A copper conductor of circular cross section 5 mm in diameter is 10 m long. Calculate its resistance at 20°C if the resistivity of copper at 20°C is 1.72 x 103 Q-m8. Given the table, solve for the following: a. Find the resistance of a 10 m long copper wire coil with a diameter of 5 cm forming a cylinder. Resistivity of Materiais at 20°c Copper 168 x10+ b. Find the width of a 10 m long aluminum sheet with a Aluminum 2.65 x10 resistance of 0.1 0. Mercury 98 x10 C. Find the length of a mercury wire coil which has a resistance of 5Q and a diameter of 10 cm forming a cylinder.
- Find the resistance(in the unit of Ohm) of a Nichrome rod of diameter d=1 mm and has a length L=5 m (resistivity of Nichrome, p = 1.8x 10-º0.m) a. 0.0001312 b. 0.02291 c. 0.107 d. None e. 0.011465. Find the resistance of a cylindrical shape copper wire with radius 25 mm which is shown in the figure. The resistivity of copper is p = 1.7 x 10-8 Qm. R=4500 mm 45° 1522 mm 993 mm20. A conductor of cross-sectional area A, length l, and resistivity ρ has resistance R. What is the new resistance if it is stretched to 2 times its original length while the area is quadrupled? Group of answer choices Two times the original resistance Four times the original resistance A quarter of the original resistance Half of the original resistance
- 3. An aluminum wire of diameter D and length L has a resistance of 1.5 n. Find the length of another aluminum wire at the same temperature if its diameter is 2D and its resistance is 6 n, (16L)4. A conductor of radius r, length and resistivity phas resistance R. It is melted down and formed into a new conductor, also cylindrical, with one fourth the length of the original conductor. Find the resistance of the new conductor.Calculate the length of a certain metal wire of diameter 0.15mm is needed for the wire to have a resistance of 15ohm. The resistivity of this metal is 1.68x10-8 ohm.m