in the web page http://www.allaboutcircuits.com/vol_3/chpt_1/2.html which discusses "Active versus Passive Devices" the definition for Passive Devices is given:
Components incapable of controlling current by means of another electrical signal are called passive devices.
But,it should be,
Components incapable of controlling current by themselves but can do so by means of another electrical signal are called passive devices
Components incapable of controlling current by means of another electrical signal are called passive devices.
But,it should be,
Components incapable of controlling current by themselves but can do so by means of another electrical signal are called passive devices