1. The problem statement, all variables and given/known data Hello all, there are three fairly simple electronics related questions of an assignment to be handed in tomorrow, and whilst the initial answers as obvious, I'd greatly appreciate some assistance on elaborating on certain questions: 1. Explain the reasons for requiring a constant DC voltage for most electronic devices. 2. Explain why batteries are not an adequate solution to DC power requirements. 3. Explain the need for conversion of domestic AC supply to DC. 3. The attempt at a solution Obviously for 1: The majority of small, electrical appliances, eg phone chargers and children's toys require a small voltage. What I'm querying however, is the fundamental difference between AC and DC and why such devices could not operate on AC? For 2: Life-span as a main answer, is this a correct starting point? Is there any other general difference considering a battery provides a completely flat DC voltage? For 3: Well obviously due to safety, and AC is cheaper as a mains source etc. But what would be the consequence of not using AC? Any help or advice would be greatly appreciated, thanks for reading!