A 0.900-V potential difference is maintained across a 1.50-m length of tungsten wire that has a cross-sectional area of 0.700 mm2. What is the current in the wire?

Explanation:

Current can be determined by Ohm's Law, whose expression is:

Where is the electrical resistance, whose formula is described below:

Where , and are the electrical resistivity and wire length and cross area, respectively. The electrical resistivity for tungsten is . Finally, the electrical resistance is computed herein:

Moreover, the current in the wire is:

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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