The term 'electrical converter' can be broken down into two crossword solutions: 'DYNAMO' (6 letters) and 'powerpack' (9 letters). A DYNAMO is a device that converts mechanical energy into electrical energy, usually through the use of a rotating magnetic field. A powerpack is a device that stores energy in a battery and then releases it as electrical energy when needed. Both of these devices are used to convert energy from one form to another, making them essential components of any electrical system.