A 1 m long electrically conductive wire made of material X has electrical conductivity of 0.2x107(ohm-m)-1, and end-to-end resistance of 10 ohms. What is the diameter of the wire? 0.15 mm 0.20 mm 0.25 mm 0.30 mm
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- A copper wire has a resistance of 0.51 Ω at 20.0°C, and an iron wire has a resistance of 0.57 Ω at the same temperature. At what temperature, in degrees Celsius, are their resistances equal? The temperature coefficient of resistivity of copper is 3.9 × 10-3 (°C)-1, while that for iron is 5.0 × 10-3 (°C)-1.A tungsten wire is used to determine the melting point of indium. The resistance of the tungsten wire is 2.221 at 20.0°C and increases to 4.307 as the indium starts to melt. αtungsten = 4.50 x 10−3 (°C)−1. What is the melting temperature of indium in °C?The resistivity of a 100 m long copper wire is 1.72 x 10-80m. If the cross sectional area of the wire is 6 x 10-6m2, what is its resistance? 0.30 30 30 300
- A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 39.5 Q at 20.0°C. If its resistance increases to 40.2 Q at 28.5°C, what is the temperature coefficient of resistivity? (°C)-1Gold is the most ductile of all metals. For example, 2 gram of gold can be drawn into a wire 2.4 km long. The density of gold is 19.3 x 103 kg/m3, and its resistivity is 2.44 x 10-8 Vm. What is the resistance of such a wire at 20.0°C? 2984 Ohms 1356 Ohms 1356250 Ohms 565OhmsDiscussion: Ohm's Law describes the relationship between the resistance (R) of a wire, the roltage drop across it (V), and current through it (D): V = RI (1) Applying a known current to a wire and measuring the voltage across it will lt you determine the resistance of the wire by solving equation 1: R =, (2) The resistance of a partieular element depends on its geometry, the resistivity and the temperature. Resistivity is the tendency of the material to behave as a resistor and is an inherent property of a material, in the same sense that density or thermal expansion are inherent properties. Materials with lower resistivity, like copper, are good conductors of electricity and widely used in eireuit components while those with larger resistivity, like rubber, are used as insulators. For a wire with length (L), cross-sectional area (A), and made from a material with resistiity (p) the resistance (R) will be given by the following equation: R= L (3) In case that the geometry (length and…
- A copper wire has a resistance of 0.565 N at 20.0°C, and an iron wire has a resistance of 0.597 N at the same temperature. At what temperature are their resistances equal? The temperature coefficient of resistivity for copper is 3.90 x 10-3(°C)-1 and for iron it is 5.00 x 10-3(°C)-1. °CAn engineering intern is studying the effect of temperature on the resistance of a current carrying wire. She applies a voltage to a aluminum wire at a temperature of 53.0°C and notes that it produces a current of 1.10 A. If she then applies the same voltage to the same wire at -88.0°C, what current should she expect (in A)? The temperature coefficient of resistivity for aluminum is 3.90 x 10-³ (°C)-¹. (Assume that the reference temperature is 20°C.) A