Asked by Tristan
A "Bus" bar is in the form of a slab of copper 2meters long, 1cm wide, and 10 cm thick.
a) What is the resistance of the bar at 0 degrees celcius?
b) What potential difference is needed to push 5000 amps through the bar?
a) What is the resistance of the bar at 0 degrees celcius?
b) What potential difference is needed to push 5000 amps through the bar?
Answers
Answered by
drwls
Look up the resistivity of copper. Call it r. For pure copper,
r = 1.67*10^-7 ohm-cm
(a) Multiply "r" by the bar's length (200 cm) and divide by the cross sectional area (10 cm^2), to get the resistance in ohms, R.
(b) V = I * R (volts)
I = 5000 A
Solve for V
r = 1.67*10^-7 ohm-cm
(a) Multiply "r" by the bar's length (200 cm) and divide by the cross sectional area (10 cm^2), to get the resistance in ohms, R.
(b) V = I * R (volts)
I = 5000 A
Solve for V
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