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Electrical power diagram showing voltage across a load and current through it, with power measured in watts as energy transferred per second

Electrical Power and Heat: Phone Repair Basics,...

Understand electrical power as energy transferred each second, use P = V × I in simple examples, and learn why voltage alone cannot tell you a component's heat or temperature.

Electrical Power and Heat: Phone Repair Basics,...

Understand electrical power as energy transferred each second, use P = V × I in simple examples, and learn why voltage alone cannot tell you a component's heat or temperature.

Ohm's law formula diagram showing voltage V above current I and resistance R, with V equals I times R and its two rearrangements

Ohm's Law Explained: Phone Repair Basics, Lesson 5

Learn Ohm's law step by step: use V = I × R to calculate voltage, current or resistance, convert units correctly, and recognize when the model should not be used...

Ohm's Law Explained: Phone Repair Basics, Lesson 5

Learn Ohm's law step by step: use V = I × R to calculate voltage, current or resistance, convert units correctly, and recognize when the model should not be used...

Resistance comparison diagram showing a short wide conductor, a long narrow conductor and different materials, with the factors labeled clearly

What Is Resistance? Phone Repair Basics, Lesson 4

Learn what electrical resistance means, how ohms measure opposition to current, why wire size and material matter, and how to use resistance concepts safely in beginner phone repair.

What Is Resistance? Phone Repair Basics, Lesson 4

Learn what electrical resistance means, how ohms measure opposition to current, why wire size and material matter, and how to use resistance concepts safely in beginner phone repair.

Current unit conversions showing 1 ampere equals 1000 milliamperes and 1000000 microamperes, with a worked charge-per-time example

What Is Electric Current? Phone Repair Basics, ...

Understand electric current as the rate of charge flow. Learn amperes, milliamperes and microamperes, compare conventional current with electron movement, and follow current around a simple loop with worked practice...

What Is Electric Current? Phone Repair Basics, ...

Understand electric current as the rate of charge flow. Learn amperes, milliamperes and microamperes, compare conventional current with electron movement, and follow current around a simple loop with worked practice...

The same three circuit points labeled with C at zero volts, then B at zero volts; the voltage difference between A and B stays two volts

What Is Voltage? Phone Repair Basics, Lesson 2

Understand voltage as a difference between two points. Learn how reference points and polarity affect readings, why voltage can remain in an open circuit, and check your understanding with worked...

What Is Voltage? Phone Repair Basics, Lesson 2

Understand voltage as a difference between two points. Learn how reference points and polarity affect readings, why voltage can remain in an open circuit, and check your understanding with worked...

Closed DC circuit with a source, closed switch, lamp and complete return path; arrows show conventional current

What Is an Electric Circuit? Phone Repair Basic...

Start learning phone repair with a simple circuit. Identify the source, wires, load and switch, trace the return path, and compare open and closed circuits.

What Is an Electric Circuit? Phone Repair Basic...

Start learning phone repair with a simple circuit. Identify the source, wires, load and switch, trace the return path, and compare open and closed circuits.