## Ohm’s Law and the Electric Power

Ohm’s Law relates in one equation the voltage, the current and resistance. Resistance = Resistor’s value.

A more complete expression of Ohm’s Law is achieved using the electric power formula

•
128
Shares
• 128
•
•
•
•
•
•

## Power Supply block Diagram (AC – DC conversion process)

Power Supply block Diagram

Many electronic circuits need a direct current (DC) voltage source, but what we commonly find are voltage sources of alternating current (AC). In order to achieve a direct current voltage source, the alternating current input must follow a conversion process.

•
128
Shares
• 128
•
•
•
•
•
•

## Measuring Low Resistances – Very easy

Measuring Low Resistances

There are special cases of measuring low resistances, where the value of the component to be measured is too small and the direct measurement using a multimeter / tester is not practical.

•
128
Shares
• 128
•
•
•
•
•
•

## How to Measure Beta of a Transistor? (β / hfe of transistor)

How to Measure Beta of a Transistor? (β / hfe of transistor)

The beta (β) is a characteristic of each transistor. This feature is found in the NTE, ECG manuals, etc. These manuals have a minimum or approximate values of the real values. This means that we do not know the real value of the transistor.

•
128
Shares
• 128
•
•
•
•
•
•

## Transistorized Voltage Regulator (Zener & Transistor)

Transistorized Voltage Regulator Why use a transistorized voltage regulator? If we use a half or a full-wave rectifier we can convert an AC voltage in a DC one. This converted voltage is unregulated, because the output voltage is not constant and can change due to variations of the load value. To reduce these variations we connect […]

•
128
Shares
• 128
•
•
•
•
•
•

## Current Limiter for Voltage Regulator using Transistor

Current Limiter for Voltage Regulator using Transistor

If the current required in the load exceeds the maximum allowed, the voltage regulator can be damaged. To avoid this problem it is necessary to have over current protection.

•
128
Shares
• 128
•
•
•
•
•
•