# Alternating Current (AC) Training

### 402-01 Introduction to Alternating Current

When you complete this lesson, you will be able to explain the differences between AC power and DC power, define terminology relating to graphing AC power, and explain what is meant by effective values of AC power. You will also be able to describe the common production of AC power and define terminology regarding the characteristics of AC power.

- Explain the difference between AC power and DC power
- Define terminology relating to graphing AC power
- Explain what is meant by effective values of AC power
- Describe the common production of AC power
- Define terms regarding some characteristics of AC power

### 402-02 Ohm’s and Kirchhoff’s Laws Involving AC Circuits

When you complete this lesson, you will be able to describe Ohm’s law and Kirchhoff’s current and voltage laws as they relate to AC circuits. You will also be able to calculate power in a resistive AC circuit.

- Describe Ohm’s law as it relates to AC circuits
- Describe Kirchhoff’s current law using an AC circuit example
- Describe Kirchhoff’s voltage law using an AC circuit example
- Apply Ohm’s law to determine power in a resistive AC circuit

### 402-03 Inductance in AC Circuits

When you complete this lesson, you will able to understand and calculate values of inductance and find the total amount of inductive reactance in a circuit.

- Describe the principle of induction
- Define the three factors needed for electromagnetic induction
- Define inductance
- Determine the total inductance of a circuit
- Describe inductive reactance and what is needed to calculate its value in the circuit

### 402-04 Capacitance in AC Circuits

When you complete this lesson, you will understand how capacitance reacts in an AC circuit, be able to calculate total values, and understand calculations for capacitive reactance.

- Describe the properties of a capacitor and an electrostatic field
- Describe how a capacitor charges and discharges
- Describe how a capacitor opposes the voltage in a circuit
- Identify the values of capacitance
- Describe capacitance in series and in parallel
- Demonstrate the calculation of capacitive reactance

### 402-05 Impedance in AC Circuits

When you complete this lesson, you will be able to determine the total impedance of an AC circuit and apply Ohm’s law to find other unknown values.

- Describe a phasor diagram
- Demonstrate the use of Ohm’s law to calculate for unknowns in an AC circuit
- Define impedance
- Identify the steps to find impedance in a resistive-inductive series AC circuit
- Identify the steps to find impedance in a resistive-capacitive series AC circuit
- Identify the different steps needed to find impedance in a parallel AC circuit of resistance and reactance

### 402-06 AC Power

When you complete this lesson, you will be able to calculate for unknown values in a power triangle and calculate power factor.

- Describe the trigonometric functions for right triangles
- Identify the differences between real, apparent, and reactive power
- Describe power factor
- Explain power factor correction
- Describe power in a purely resistive AC circuit
- Describe power in a capacitive or inductive circuit
- Apply power value calculation

### 402-07 Fundamentals of Three-Phase AC

When you complete this lesson, you will be able to identify the construction of an AC circuit, calculate the circuits’ capacity value, and conduct power factor corrections in AC circuits.

- Describe the differences between three-phase and single-phase voltages
- Describe the characteristics of delta and wye connections
- Calculate current and voltage for delta connected circuits
- Calculate current and voltage for wye connected circuits
- Describe the purpose of power factor
- Calculate capacitance needed to make a power factor correction