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What does PWM normally stand for?

“PWM” stems from electrical engineering and is short for “pulse width modulation”, which is also known as “pulse-duration modulation”. What it means is that you can use it to almost freely control the RPM of a fan. The speed of regular fans can be modified by voltage regulation.

How to set up PWM?

p = IO.PWM(output channel , frequency of PWM signal) The above command is for setting up the channel and also for setting up the frequency of the PWM signal. ‘p’ here is a variable it can be anything. We are using GPIO19 as the PWM output channel. ‘frequency of PWM signal’ has been chosen 100, as we don’t want to see LED blinking.

Does PWM reduce voltage, current, or power?

PWM (Pulsed Width Modulation) reduce neither the voltage or current, it reduces the averaged voltage and current by changing the amount of on time compared to off time this force is applied which will reduce the average power but the instantaneous power is the product of the voltage x current.