Explain how PWM (pulse width modulation) works and some of its applications, such as controlling the speed of DC motors (DC or direct current), servo motors, TRIAC drives, temperature control by activating coolers and varying their speed, switching power supplies for LEDs, and others. We also talk about applications in Arduino and electronics, using PIC or 8051 microcontrollers and using the output signal from the PWM pins to control peripherals through drivers. It is possible to make a PWM even using a 555 and simple operating circuits. When it comes to electronics, controlling DC motors and varying the speed or brightness of LEDs is one of the most commonly used tasks for educational purposes. Among the objectives of this video, we highlight: We highlight what PWM is and how it is used for power control. We address the following items throughout this video: Common terms such as switching power supply, switching, and power control are linked to the meaning of PWM. PWM stands for pulse width modulation. PWM is used, for example, to control the power of a load. Power control of a load can be done by controlling its voltage; changing the voltage results in a change in power. There is linear power control, which is done with a rheostat in series with the load. As the resistance of the rheostat changes, the power of the load changes. Linear power control is not as effective due to losses in the resistance of the rheostat. PWM consists of using a switch that opens and closes in very rapid periods, causing an average voltage in the load and thus a power proportional to this voltage. PWM is formed by active work cycles and inactive work cycles, with the switch being closed and open respectively. The great advantage of PWM is that the losses in the circuit that does the switching are minimal. Highlighted parts in this video: 00:40 - PWM can be used in many devices, such as charge controllers used in photovoltaic energy capture systems. 01:24 - Understanding what electrical power is is essential for studying PWM circuits. 01:58 - Rheostats and potentiometers are variable resistances used in linear load controls. 02:44 - Potential difference across resistors is pure Joule effect, i.e. heating, which can represent energy losses. 03:17 - The entire table was based on direct calculations from Ohm's law, which are essential for understanding the behavior of an electrical circuit. 04:06 - A switch simply interrupts or allows the passage of electrical current through a certain section of a circuit, and is used to control electrical circuits. 05:21 - The magnitude of electrical voltage is the foundation of electricity; it is necessary to understand its concept as a basis. 05:43 - There is a big difference between average response measuring equipment and so-called true RMS. 06:26 - Understanding electric current is very important when studying PWM. Other videos that complement this subject: How to Install a Switch and a Light Bulb - Step by Step • How to Install a Switch and a Light Bulb -... Incandescent GRAPHITE Bulb • Incandescent GRAPHITE Bulb #MEL_00302 -- Mundo da Elétrica is an electricity channel with quality videos for you to learn on your cell phone, tablet or on your living room TV. Electricity for everyone! Online classes, PDF manuals, electrical diagrams and explanations! Join Mundo da Elétrica: On Youtube (click and subscribe): http://goo.gl/vXru8M Mundo da Elétrica Website: http://www.mundodaeletrica.com.br Mundo da Elétrica Facebook: /mundodaeletrica Mundo da Elétrica Google Plus: https://plus.google.com/+Mundodaeletr... Mundo da Elétrica Twitter: /mundodaeletrica