# Applied Electricity I

HVAC 140

## Course Description

Prerequisite: MATH LEVEL 4. Covers basic fundamentals of electricity that include introductory schematic symbols and basic electrical circuits, Ohms law, power formulas, series and parallel circuit rules, combination circuits, magnetism, capacitance, inductance and reactance in electrical DC and AC circuits. Applies the above fundamentals to electrical circuits and electrical schematics; calculate voltage, current, resistance and wattage as they apply in an electrical circuit; interpret electrical problems on the refrigeration or heating unit. Uses the multi meter as an Ohmmeter, as a voltmeter, and as an amp meter. Credit may be earned in one of the following: HVAC 140, RHA 140, or SKET 106. (45-0)

## Outcomes and Objectives

### Define the fundamentals of electricity and how it is produced.

#### Objectives:

• Identify the atomic structure of the atom and how it relates to electricity.
• Identify five methods by which electricity is formed and produced.
• Identify voltage, current, and resistance and how they interact in an electrical circuit.
• Identify the four main characteristics of an electrical circuit.
• Identify the differences between AC current and DC current.
• Identify how wires have resistance.
• Identify different types of resistors and resistive materials.
• Identify carbon resistors values by using a color code chart.

### Identify specific electrical symbols and devices used in an electrical circuit.

#### Objectives:

• List and correctly label electrical symbols used for current flow = I/Resistance = R/Voltage = E or V/Voltage Drop = VD/Watts = W or P.
• List and identify electrical symbols for resistors/ motors/ solenoids/ relays/ switches/ pressure controls/ control types/ and transformers as they are seen in electrical wire diagrams.
• Trace electrical circuits in a wire diagram and identify the components involved.

### Identify how Ohms law relates electrical circuit components of voltage, current, and resistance.

#### Objectives:

• Solve electrical problems using Ohms law and its components.
• Calculate electrical loads, resistance changes, current changes, and voltage drops using Ohms law calculations.

### Demonstrate the differences between series circuits and parallel circuits.

#### Objectives:

• Identify the components of a series circuit.
• State the rules for a series circuit.
• Apply series circuit rules to calculate changes in E, R, and I.
• Identify the components of a parallel circuit.
• State the rules for a parallel circuit.
• Apply parallel circuit rules to calculate changes in E, I, and R.
• Determine voltages, currents, resistance, wattages, and voltage drops in series and parallel circuits.

### Identify magnesium fundamentals.

#### Objectives:

• Identify forms of magnetism and how the magnetism is formed.
• Identify how electrical magnetism is created.
• Identify methods of increasing the intensity of magnetism.
• Identify how magnetism can create electricity.
• Identify magnetic induction and its effects on a circuit and components.
• Identify how magnetism works in circuit components such as relay coils, transformers, motors, and valve coils.

### Identify how a capacitor works and define the term "capacitance".

#### Objectives:

• Identify the types and parts of a capacitor.
• Define "capacitance" and its value rating in microfarads.
• Identify capacitor voltage ratings.
• Define "capacitive reactance" and its effect on the circuit.
• Identify the relationship of capacitive and the AC sine wave.

### Identify inductive reactance and its relationship in the AC circuit.

#### Objectives:

• Identify inductive reactance and how it occurs in a circuit.
• Identify the effects of inductive reactance in an AC circuit.
• Identify the effects of inductive reactance in a DC circuit.
• Identify how inductive reactance affects the AC sine wave.
• Identify the effects of inductive reactance on a AC circuit.

### Identify how to use a multi meter to measure voltage, resistance, and current.

#### Objectives:

• Measure voltage using a multi meter.
• Measure resistance using a multi meter.
• Measure AC current using a multi meter.
• Measure DC current using a multi meter.
• Calculate wattages using voltage and current measurements.