1. The speed of an electron revolves around the center of the nucleus while electrical motion depends on the current of electrons.
2. Resistance can change energy by slowing it down so it can be used more efficiently and not damage an appliance(s). An example is chargers for devices such as cell phones or ac adapter charger for a laptop.
3. A DC current only travels in one direction while an AC current travels back and forth.
4a. 14ohm
4b. 3.4ohm
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