firstly, voltage drops across a load. but, remember that voltage indicates an electrical potential; so that the sum of the drops across the loads in circuit will be equal to the total voltage of that circuit. | ENERGY | |
secondly, and more relevant here, is that when current flows through a resistor, heat is a product. of course, the heat could be considered a by-product, it just depends on how you look at it. and in the case of a motor, while heat is produced, so is mechanical motion. | ||