A resistor is constructed of a carbon rod that has a uniform cross-sectional are

Question

A resistor is constructed of a carbon rod that has a uniform cross-sectional area of 5.30 mm2. When a potential difference of 12.0 V is applied across the ends of the rod, the rod carries a current of 3.60 ? 10-3 A.

A resistor is constructed of a carbon rod that has a uniform cross-sectional area of 5.30 mm^2. When a potential difference of 12.0 V is applied across the ends of the rod, the rod carries a current of 3.60 ? 10^-3 A. (a) Find the resistance of the rod. kohm (b) Find the rod's length. m

Explanation / Answer

Here ,

a)

Using Ohm's law

V = IR

R = V/I

R = 12/3.6 *10^-3

R = 3.33 Kohm

the resistance is 3.33 Kohm

b)

b)

as

3333.33 = 0.35 * L / (5.3 *10^-6)

L = 0.05 m

the length of resistor is 0.05 m

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