# In a power supply, the current is a constant or gives whats the component/circuit need ? [duplicate]

I everybody, sorry for my english :D .

i'm a begginer of electronic and i'm learning a lot of electronic component, voltages, current and so on.

My question is about a charger (phone charger for example) or a power supply (if it's comparable).

I know that if i use a battery for the motor, this only take the current that need (for example, 200mAh).

If i have a 5v and a 500mA phone charger and i use to power a motor. The motor it's going to receive 5V and 500mA (and maybe, blow up (?)) or 5V and the current that they need ?

If the 2° answer is the correct, can i suppose that the 500mA is the MAX current output that the phone charger can give?

Thank you very much !

## marked as duplicate by Olin Lathrop, Vladimir Cravero, PeterJ, Daniel Grillo, RicardoMay 6 '15 at 18:47

On the other hand that does not mean "you don't blow up" your device when a relatively more powerful supply is connected. There must be upper limits on the motor specs, but this generally applies to voltage, because voltage is the only thing that needs to be same in both ouput of the power supply and input of the device (in your case, motor).