A square shaped (5.8 mm by 5.8 mm) metal rod has resistance of 1.79 ohm. The res

Question

A square shaped (5.8 mm by 5.8 mm) metal rod has resistance of 1.79 ohm. The resistivity of material is 0.5^* 1.79'^*10^-6 ohm-m. What is the length of the rod in meter? Your Answer: In the following circuit, R_1 = 25.4 Ohm, R_2 = 4^* 5 Ohm, R_3 = 4^* 5 Ohm, R_4 = 2^* 5 Ohm, R_5 = 25.4 Ohm. Calculate the equivalent resistance of the circuit. [Picture File - Ohm- 1/jpg] Your Answer: In the following circuit, R_1 = 10 Ohm, R_2 = 4^* 4.6 Ohm, R_3 = 4^* 4.6 Ohm. R_4=2^* 4.6 Ohm, R_5 = 10 Ohm and E = 10 Volt. Calculate the current in R_5 resistor. (Picture File- Ohm-2.jpg) Your Answer:

Explanation / Answer

1) R =1.79 ohm , A =5.8mm*5.8 mm , p = 0.5*1.79*10^-6 ohm .m

R = pL/A

1.79 = 0.5*1.79*10^-6*L/(5.8*5.8*10^-6)

L =67.28 m

2) 1/R234 = (1/(4*5)) +(1/(4*5))+(1/(2*5))

R234 = 5 ohm

R12345 = 25.4 +5+ 25.4 = 55.8 ohm

3) 1/R234 = (1/(4*4.6)) +(1/(4*4.6))+(1/(2*4.6))

R234 = 4.6 ohm

R12345 = 10+4.6+10 = 24.6 ohm

V = iR

10 = 24.6*i

i =0.4065 A

in sereis combination current is constant

current through R5 is 0.4065 A

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