What voltage will the voltmeter show when connected to the ends of a steel wire 5 m long and with a cross-sectional
| November 22, 2020 | education
What voltage will the voltmeter show when connected to the ends of a steel wire 5 m long and with a cross-sectional area of 0.2 mm2, if the ammeter connected in series with it shows 1.2A?
The specific resistance of steel is 0.15 Ohm × mm squared, R = pl / s = 0.15 Ohm × mm2 × 5m / 0.2mm2 = 3.75 Ohm.
Ohm’s law I = U / R -> U = RI = 3.75Ω × 1.2A = 4.5V.
Answer: 4.5V
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