prender
turn on
power
to turn on
+
-er
verb suffix
Prender means to turn on and can be thought of as power0 + -er1 (verb1).
verb
  1. turn on
    To turn on or light up
    Por favor, prende la luz. // Please turn on the light.
  2. arrest
    To arrest or apprehend
    La policía prendió al ladrón. // The police arrested the thief.