Question

1.

Part A

What is the diameter of a 1.00-m length of tungsten wire whose resistance is 0.45 Ω ? Express your answer using two significant figures.

2.

Part A

What is the maximum instantaneous power dissipated by a 3.4-hp pump connected to a 240-Vrms ac power source? 1 hp = 746 W.

Express your answer using two significant figures.

Part B

What is the maximum current passing through the pump?

Express your answer to two significant figures and include the appropriate units

3.

A 0.64-mm-diameter copper wire carries a tiny current of 2.9 μA . The molar mass of copper is 63.5 g/mole and its density is 8900 kg/m3. NA=6.02×1023.

Part A

Estimate the electron drift velocity. Assume one free electron per atom.

Express your answer to two significant figures and include the appropriate units.

Answer 1

Given data First we will convert power from hp into Watts Power 3.4 hp (3.4 hp) (745.69 W /hp) -2535.35W V240V Maximum voltage is -(240 V)V2 -339.411V Therms current is PM 2535.35 240 10.56A Part (B) Maximum current is (10.56) 2 -14.93A Part (A) Now the peak power is the peak current time's peak voltage (14.93) (339.41) -5067.39W

Given data The current isi- 2.9 x10-6 A The density is p 8900kg/m3 The diameter is d 0.64mm N 6.02x1025 M-б3.5g/mole The area is, 4 A(0.64x10 4 3.22x10'm N4 M Ne (LL) m M (6.02x10 (8900) 63.5x10 -8.44x1028 Part (A) The electron drift velocity is, neA 2.9x10 8.44x10 (1.6x10-19 (3.22x10-7 -6.67 x 10-10m/s