3. At 20° C, 33 meters of copper wire has a resistance of 0.639 ohms. What is the resistance of 165 meters? Given: Find: Formula: Substitution: Solution:
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- 2. The resistance of a certain conductor , 300 mil diameter and 20 ft long is 200 x10^-3 N. Calculate its resistivity in micro-ohms (µ-2). 3. Determine the thermal coefficient of resistance of copper at 50°C, then use this value toAluminum wire has diameter of 3 mm. How many meters of this wire would be needed to give resistance 2 Ω if the resistivity of aluminum is 2.8 × 10−8Ω. ?.3. When the temperature is 5oC, the resistance of the carbon resistor is 217.2Ω. What is the temperature if the resistance is 212.7?
- What is the resistance (in Ohms) of a wire made of a material with a resistivity of 3.3x 10-82. m if its length is 4 m and its diameter is 0.64 mm?R2 V. What is the resistance of The following circuit carries a current of 200.0 mA. 7, - 6 2 V and Vsource = 15 Vi = 6.2 R, V R,A piece of wire of length 104.2 cm and cross- sectional area 278.1 cm² is made from a material of resistivity 10.5 ohm-metre. What is the resistance of this wire?