A1 m length of wire is found to have a resistance of 35 ohms. If the diameter of the wire is 3 mm, find the resistivity in ohms-meter.
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- Some copper wire has a resistance of 200 at 20 ° C . A current is passed through the wire and the temperature rises to 90 ° C . Determine the resistance of the wire at 90 ° C , correct to the nearest ohm , assuming that the temperature coefficient of resistance is 0.004 / C at 0 ° CThe temperature coefficient of resistivity of carbon is -0.0005/C°. If the resistor is made of graphite has a resistance of 5 kΩ at 20°, find the resistance at 27°.What are the factors that affects or influence the electrical properties of a material? c) Two of you have been given two instruments with the units in ohms, your colleague measures the resistivity of the material whiles you measure the resistance. Your supervisor comes around and ask you to comment both measurements, what would you tell him?
- 1- Some copper wire has a resistance of 200 at 20°C. A current is passed through the wire and the temperature rises to 90°C. Determine the resistance of the wire at 90°C, correct to the nearest ohm, assuming that the temperature coefficient of resistance is 0.004/°C at 0°C8. The resistance of a copper at 30°C is 50 ohms. If the temperature coefficient of copper at 0°C is 0.00427. What is the resistance at 100°C? 9. A wire has a resistance R are cut into 2 pieces and the small pieces are connect in parallel resulting to a total resistance of 2 ohms. What is the value of R?Determine the resistance of a bus bar made of copper if the length is 10 meters long and the cross section is a 4 x 4 cm2. Use 1.7241 micro ohm-cm as the resistivity in ohm.
- A 1 m length of wire is found to have a resistance of 25 ohms. If the diameter of the wire is 1 mm, determine the resistivity in ohms-mA uniform 2-wire d.c. distributor 63 meters long is loaded with 0.067 resistance/ meter and is fed at one end. If the maximum permissible voltage drop is not to exceed 34 V, find the current/meter.An aluminum wire 5m long and 2mm diameter is connected in parallel with a copper wire 3m long. The total current is 4 A and that in the aluminum wire is 2.5 A. Find the diametre of the copper wire. The resistivity of copper wire being 1.7 micro ohm meter and that of aluminum taken Al 2.6 micro ohm meter
- You want to produce three cylindrical wires with a diameter of 1.00 mm, each with a resistance of 1.00 V at room temperature. One wire is gold, one is copper and one is aluminum. Refer to the resistivity table (a) How long should each wire be?Two wires A & B made from two different materials have temperature coefficient of resistance equal to 0.0025 and 0.0005 ohm per C , respectively . It is desired to make a coil of wire having a resistance of 1200ohms with a temperature coefficient of 0.001 , using suitable lengths of the two given wires connected in series . Determine the required length of wire A ?The resistance of a copper wire is 125 ohms at 100°C. Determine the resistance at 70°C Note: DRAW THE DIAGRAM