What current will pass through the graphite rod if 6V is applied?

| September 25, 2021 | education

What current will pass through the graphite rod if 6V is applied? Rod length 0.02m, cross-sectional area 2mm ^ 2, graphite mustache 13 Ohm * mm2 / m

U = 6 V.

l = 0.02 m.

S = 2 mm2.

ρ = 13 Ohm * mm2 / m.

I -?

According to Ohm’s law for a section of a circuit, the current I in a graphite rod is directly proportional to the voltage at its ends U and inversely proportional to its resistance R: I = U / R.

Since a graphite rod has a cylindrical shape, its resistance R is expressed by the formula: R = ρ * l / S, where ρ is the specific resistance of the material from which the conductor is made, that is, graphite, l is the length of the rod, S is the cross-sectional area of ​​the rod …

I = U * S / ρ * l.

I = 6 V * 2 mm2 / 13 Ohm * mm2 / m * 0.02 m = 46.15 A.

Answer: the current strength I = 46.15 A will pass through the graphite rod.



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