I have a couple of questions about electrical engineering. First, I’d like to know how voltage affects power. Everyone knows that electrical power equals voltage times amperage. I just don’t understand why though. I was taught that amperage is the amount of electricity flowing through a circuit and voltage is the pushing force behind it. It’s easy to understand how amperage would affect power, but I just don’t see how the pushing force behind the amperage could also affect power, other than indirectly by causing more amperage to flow. Are the flowing electrons more energetic or something? I hope someone can explain this in a way I can understand.
Also, heat caused by electricity (such as in a lightbulb) is equivalent solely to amperage, isn’t it? If so, why don’t electrical devices that rely on heat to work, such as lightbulbs and heaters, use a step-down transformer so that they can use that amperage at a much lower voltage thus using less power and costing less? Or am I mistaken and heat is actually equivalent to power?