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Q. 67

Expert-verified
Found in: Page 927

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# A motor attached to a power line draws an current. Its average energy dissipation is .a. What is the power factor?b. What is the rms resistor voltage?c. What is the motor’s resistance?d. How much series capacitance needs to be added to increase the power factor to ?

(a). The power factor is

(b). The rms resistor voltage is

(c). The motor's resistance is

(d). capacitance should be add to increase the power factor to 1

See the step by step solution

## Part (a) Step 1: Given information

We are given that A motor attached to a power line draws an current. Its Average energy dissipation is .

We need to find the power factor .

## Part (a) Step 2: Explanation

We are given that

so power factor is

## Part (b) Step 1: Given information

We need to find the rms resistor voltage.

## Part (b) Step 2: Explanation

We are given that

## Part (c) Step 1: Given information

We need to find the motor resistance .

## Part (c) Step 2: Explanation

We are given that

so the resistance is

Hence the motor resistance is .

## Part (d) Step 1: Given information

We need to find that How much series capacitance needs to be added to increase the power factor to ?

## Part (d) Step 2: Explanation

We are given that power factor should be one . so

so there is to add a resistance of