Basic Electrical Theory

SKU: RVI-11479Duration: 20 Minutes

This course on basic electrical theory will equip you with the knowledge you need to handle various calculations involving electrical circuits, both AC (alternating current) and DC (direct current). You will learn how to calculate voltage and electrical power in a circuit using Ohm's Law and Watt's Law. In this course, we'll discuss how to determine the electrical resistance for the wiring in a circuit and the size power unit that will be needed to drive a piece of equipment. Finally, you'll learn the difference between single- and three-phase power.

Course Details

Specs

Training Time: 20 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

• Given a formula, calculate voltage using Ohm's Law
• Given a circuit, determine Ohm's of resistance
• Given a formula, solve for resistance using Ohm's Law
• Identify the correct formulas for Ohm's Law and Watt's Law
• Identify the correct wiring configuration when replacing an electrical receptacle

Key Questions

The following key questions are answered in this module:

What are the definitions for the terms voltage, current, and resistance?
Current is the flow of electrons measured in units of amperes, or "amps." Voltage is the force which moves current through a circuit. Resistance is the degree of opposition to the flow of electricity.

What is Ohm's Law?
Within an electrical circuit there is a fixed relationship between the voltage, current and resistance at any point in the circuit. The electrical current flow is proportional to the voltage which is pushing the electrons and the amount of resistance in the load which is holding them back. As the pushing pressure, or voltage, increases, the current flow will increase, and as the resistance increases, the current flow will decrease. This relationship is Ohm's Law: I (current) = E (voltage)/R (resistance)

What is Watt's Law?
Watt's Law describes the behavior of electricty in a circuit. The amount of electrical power dissipated in a circuit is determined by the flow of electrons, or current, and the voltage pushing those electrons. This is expressed mathematically as P (Watts) = I (current) * E (voltage)

Define the different current types - DC and AC.
Constant voltage sources create constant current which always flows in the same direction. This type of flow is called DC, or direct current. Most electronic equipment, like cell phones and computers, are DC devices. Batteries and photovoltaic cells produce constant voltage. Voltage sources which regularly change from positive to negative cause electrical current to move back and forth in a conductor, creating what is called AC, or alternating current.

What are two methods of supplying alternating current?
Two methods of supplying alternating current are single phase and three phase power. Single phase power is delivered via one power, or hot wire, and one neutral wire. Three phase power is delivered via three hot wires.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

Electricity is a form of energy, and is most often thought of in the context of energy flowing through an electrical circuit. An electrical circuit is a conductive path through which electricity can flow. A basic electrical circuit is made up of four types of components: 1. A source of electrical potential difference, or voltage. A voltage may be a constant, direct current (DC) source, as would come from a battery, or it could be a regularly varying, alternating current (AC) source, as would come from a wall socket receiving power from a generator. 2. A load, or device that converts electrical energy to some other form of energy such as light, heat, or mechanical motion. Common loads are lights, motors, and heaters. A load is resistant to the flow of electricity. 3. A conductor is a material used to connect all the other elements of a circuit and allows the easy flow of electricity. The most common type of conductor is a copper wire covered with an insulating material. 4. A control component that allows easy starting, stopping or restriction of an electrical current in a closed circuit, such as a switch.
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