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# We Need Your Help with Our Next Protective Relay Online Training Class: Electricity 101!

We’re wrapping up our upcoming protective relay online training class: Understanding and Drawing Phasor Diagrams, and we are ready to get started on the next course about the electrical fundamentals that every relay tester should know. There are a lot of free resources for basic electrical theory out there and we don’t need to re-invent the wheel by describing concepts like “the potential difference between two plates” that create a voltage.

What should a relay tester understand about the electrical system in practical terms?

Here are some of our ideas so far.

### Voltage

• Created by the AVR of a generator
• Pressure that drives the current
• Voltages are added up in a series circuit
• Voltages are equal in a parallel circuit
• mv, V, and kV

### Current

• Flows through a circuit
• Currents in series are equal
• mA, A, kA

### Resistance

• The load that completes the circuit
• In every part of the electrical system

### Ohm’s Law

• Most important formula
• How to re-arrange to calculate V, A, Ohms

### Inductive Impedance

• Coil that makes electrical machines work
• Resists changes in current
• Lagging angles

### Capacitive Impedance

• Stores energy

### Power Factor

What electricity 101 information do you wish you knew from the start?

What basics of electricity do you wish you understood better?