# AC Power Chapter 11 INEL 4075 Dr. Sandra Cruz-Pol Professor Electrical Engineering UPRM - PowerPoint PPT Presentation

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AC Power Chapter 11 INEL 4075 Dr. Sandra Cruz-Pol Professor Electrical Engineering UPRM. AC steady-state Power. Electric complex power Effective values Power factor Coupled inductors Ideal Transformer. Coupled inductors;.

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AC Power Chapter 11 INEL 4075 Dr. Sandra Cruz-Pol Professor Electrical Engineering UPRM

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AC Power

Chapter 11

INEL 4075

Dr. Sandra Cruz-Pol

Professor

Electrical Engineering

UPRM

### AC steady-state Power

• Electric complex power

• Effective values

• Power factor

• Coupled inductors

• Ideal Transformer

### Coupled inductors;

*The sign of the M is positive if both currents enter or both leave the coil through the dot.

### The ideal Transformer

• N2/N1=n, ratio of turns in primary and secondary coils

• Voltage at primary is partly induced by secondary current, and vice versa.

### Ideal transformer

• If both currents enter the dots then use + sign below:

• If same polarities of the voltages are in both dots, then use + sign below:

### Transformer for down-converting

• Converts from high voltage to low voltage to provide power to houses and business.

• Up-converter is used at the generator source to step-up voltage for more efficient transmission (smaller current)