 
 <prompt> Wetin be di difference for operational power? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Operating for normal power line frequencies, universal motors dey often dey found for power wey dey less than 1000 watts. Universal motors also dey form the basis of the traditional railway traction motor for electric railways. For this use, the use of AC to power motor wey originally dey designed to run on DC go lead to efficiency losses because of eddy current heating of their magnetic components, especially the motor field pole-pieces wey, for DC, for don use solid (un-laminated) iron and dem no dey use am again. 