Humid air is a better electrical conductor than dry air. explain why you are most likely to receive a shock after walking across a carpet when the air is dry than when the air is humid.

The carpet is more likely to accumulate excess electric charge (static electricity) over time when there is no good way for it discharge. The dry air, as was said, insulates the carpet and makes it prone to such accumulation. This is less the case with humid air that allows the carpet to continuously discharge a portion of its electric charge over time and thus spares us--the walkers--a minor shock.

Energy cannot be created or destroyed. This statement is known as law of conservation of energy, and it implies that whenever a certain form of energy does change, the loss of this form of energy must have converted into an another type of energy. A typical example is an object falling to the ground: initially, the object has gravitational potential energy. As the object falls down, it loses potential energy (since its altitude from the ground decreases), but it acquires kinetic energy (because its velocity increases). In this example, potential energy has converted into kinetic energy, but the total energy of the object has remained constant.