# Tag Info

### How does this simple circuit work if the diodes are replaced by LEDs?

Short answer: as shown, this won't work hardly at all with LEDs swapped in. Why? LEDs have a much higher forward voltage drop (Vf) than normal diodes, somewhere between 1.2 and 3.5V depending on ...
• 55k
Accepted

• 17k
1 vote

### RC circuit equation why have negative sign

They should have drawn the current direction. These equations match the drawing below. These are the definitions of a capacitor and resistor, current flows into the positive end of the voltage. \\$I = ...
• 16.5k
1 vote

### Why does the reciprocal of sum of reciprocals relationship appear commonly?

It simply means that the unit you're using for this measurement is the reciprocal of the quantity that you're actually adding. When you put two resistors in series, you're literally adding more ...
• 7,647
1 vote

### Why does the reciprocal of sum of reciprocals relationship appear commonly?

It appears in many contexts, as it's the sum of the harmonic mean of the elements, one of the ways of finding the "most normal value" of a set of values. Typically it's used for rates, such ...
• 15k
1 vote

### How does this simple circuit work if the diodes are replaced by LEDs?

As already mentioned the drop over a LED is too high. Also the current is very limited. Schottkys support much higher currents. This is how I would do it (for a low power application):
• 624
1 vote

### Why does a 230V 16A socket supply only the needed current to loads?

If I connect a 150W laptop charger to a socket that supplies at home 16A 230V, it will only draw the necessary amperage needed for the laptop charger at 230V. Why? The definition of electrical power ...
• 5,432
1 vote

### Frequency compensation circuit

Your circuit is a high pass filter. The time constant of the circuit can be found by looking at the circuit from the capacitor’s point of view. The capacitor sees R an Rc in parallel. The time ...
• 1,600
1 vote

### What should my resistor wattage be to run a LED on 240VAC?

I actually found this exact thing in an old kettle I pulled apart they are using a 46 kΩ resistor in series with a standard blue LED, in series with a diode the resistor looks about 8 W capacity, ...

Only top scored, non community-wiki answers of a minimum length are eligible