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How do you determine the voltage and amperage of an LED?
To calculate an LED’s power use, simply multiply the LED’s voltage (in volts) by the LED’s current (in amperes). The result, measured in watts, is the amount of power your LEDs use. For example, if your LED has a voltage of 3.6 and a current of 20 milliamperes, it will use 72 milliwatts of power.
How many outlets can be on a 20 amp circuit?
ten outlets
The answer to the question how many outlets on a 20 amp circuit is ten outlets. Always comply with the 80% circuit and breaker load rule, allowing a maximum load of 1.5 amps per receptacle. Remember that your circuit, wire sizes, and outlets must be compatible to avoid overheating and electrical hazards.
What should the voltage of an led be?
So generally when one has an LED in series with a resistor, it seems the LED will always have voltage drop corresponding of around 2V (more exact value can be read from datasheet).
How does the current flow through an led?
With the LED there, all the current will flow through the LED, and no current will flow through the Zener, as there will only be 2 volts across it. The LED datasheet will show the typical voltage across the LED with some specified current. Often, there will be a graph showing how the voltage varies with current.
What happens when you double the voltage of an led?
If you double the voltage the current will double and the power used will go up by a factor of 4 (not quite true, there are some temperature related effects but close enough for now). An LED on the other hand is a diode, like most diodes it has a a relatively fixed forward bias voltage.
Why does a Zener have a Max Voltage of 2V?
This is because if you try to put more than 2v across an LED (assuming the forward voltage is 2v), you will get a very high current flow (amps, not mA) which the resistor will limit with a large voltage drop. So the circuit will end up stabilizing with 2V across both the LED and zener, but with little current flowing through the zener.