A copper wire with a length of 5 meters and a cross-sectional a 10−6 m² has a resistivity of 1.68 × 10-8 № · m. Calculate the copper wire. 2. Resistor Temperature Dependence: The resistance of a tungsten filament in an incandescent light b room temperature. If the temperature of the filament increases becomes 75 ohms, calculate the percentage increase in resista
A copper wire with a length of 5 meters and a cross-sectional a 10−6 m² has a resistivity of 1.68 × 10-8 № · m. Calculate the copper wire. 2. Resistor Temperature Dependence: The resistance of a tungsten filament in an incandescent light b room temperature. If the temperature of the filament increases becomes 75 ohms, calculate the percentage increase in resista
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Transcribed Image Text:1. Conductor Resistance:
A copper wire with a length of 5 meters and a cross-sectional area of 3 ×
10-6 m² has a resistivity of 1.68 × 10-8 Nm. Calculate the resistance of the
copper wire.
2. Resistor Temperature Dependence:
The resistance of a tungsten filament in an incandescent light bulb is 50 ohms at
room temperature. If the temperature of the filament increases, and its resistance
becomes 75 ohms, calculate the percentage increase in resistance.
3. Material Comparison:
Two wires, one made of aluminum and the other of copper, have the same length
and cross-sectional area. If the resistivity of aluminum is 2.82 × 10−8 N · m and
the resistivity of copper is 1.68 × 10-8 N · m, compare the resistance of the
two wires.
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