Three resistors are made out of three different materials and have different (bu

Question

Three resistors are made out of three different materials and have different (but uniform) cross-sections. Resistor 1 has a circular cross-section of radius 2.90 mm. Resistor 2 has a square cross section with a side length of 1.37 mm. The third resistor's cross-section is a right triangle with two sides of length 3.56 mm as shown. All of the resistors are 0.838 cm in length. Use the provided table of resistivities to calculate the resistance of each resistor.

material 1: 8.15x10^-3

material 2: .294

material 3: 3.51x10^-5

Explanation / Answer

resistance = resistivity x Length / Area

R1 = 8.15 x 10-3 x 0.838 x 10-2 / (pi x 2.90^2 x 10-6)   = 2.58 Ohm

R2 = 0.294 x 0.838 x 10-2 / (1.37 x 10-3)^2   = 1312.65 ohm

R3 = 3.51 x 10-5 x 0.838 x 10-2 / (3.56 x 10^-3)^2/2    = 0.0464 Ohm

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