When it comes to choosing a power source, it is often some confusion.
So, I thought it was to clarify some doubts and give you a simple, easy for beginners method of selecting the power source.
Let's start with the basics.
Power supply unit as characteristics of a voltage and current:
- Voltage - is the output voltage from the power source.
- Current - this is the maximum current that can give power supply.
Voltage
The first thing to remember when selecting a power supply, this voltage. What is the voltage necessary for your powered device?
Explanation here is simple.
If your device requires a 9V, you need a power supply of 9 V. If your device needs 5V, you need a power supply of 5 V.
all just here. We go further :)
Current
The second thing you should consider - is current.
It's a bit more complicated and causes a lot of confusion for beginners.
The device that you want to activate, will need a certain amount of current. If you bought the device somewhere, either on himself or in the technical documentation should indicate how much current it needs to operate.
If you created the system yourself, you can calculate or measure the amount of current required.
So, let's say, your device requires 1 A (ampere). This means that you need to choose a power supply that can provide at least 1 A.
What about power?
Sometimes the power supply characteristics, you can find a certain number of watts (W). W - it's just a voltage multiplied by current. Thus, if you have a power supply unit 5, which can supply a current of 1 A, you have the power supply 5 watts.
If your power supply, you can see the value of 100 watts of power and 12 volts, you can specify a maximum current of a simple calculation:
output current divided by voltage. So this is 100/12 = 8.3 A.
Frequently asked questions on this subject
Question: I have a block 3A power supply, it will damage my device is 500mA?
Answer: Not. 3A Power supply will not give exactly 3 And in your device. Power supply 3A will provide current up to 3A. Therefore, to actually use your device will only 500mA of these maximum 3A
Question: on my device is written 5V (DC) 1A. What power supply do I need?
Answer: You need a power supply that produces 5 VDC and a maximum current of more than 1 A.
Question: my circuit require 9 if I can use the 12V power supply?
Answer: Not. If your circuit is required in 9 and you connect it to the 12, it is likely that she "burned"
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