user14669: according to this the recommended input voltage is between 7 and 12 volts.
The question is what is the difference between providing 7 volts(minimum recommended volts) and 12 volts(maximum recommended volts) ?.

user4143: The amount of heat dissipated by the voltage regulator.  The higher the voltage you supply the hotter the regulator will get.

14669: <p>according to <a href="https://www.arduino.cc/en/Main/ArduinoBoardUno" rel="nofollow">this</a> the recommended input voltage is between 7 and 12 volts.<br>
The question is what is the difference between providing 7 volts(minimum recommended volts) and 12 volts(maximum recommended volts) ?.</p>
 4143: <p>The amount of heat dissipated by the voltage regulator.  The higher the voltage you supply the hotter the regulator will get.</p>
