Teacher:In this task, you are given a paragraph, and your task is to construct a question from the given passage. Construct question in such a way that (i) it is well explained in the paragraph, (ii) the words may/may not be present in the paragraph, (iii) it should start with what/how/describe. Avoid creating a question that (i) is just relevant to one or two sentences, and (ii) not relevant to passage. 
Teacher: Now, understand the problem? Solve this instance: Electricity enters the power supply unit. The power supply gives electricity to transistors. The power supply gives electricity to the CPU. The systems use electricity to complete tasks. The signals they complete are sent out as visual signals. The energy is used to complete computations. 
Student:
Describe the energy transformations in a computer