Final answer:
Cell phones convert electrical energy into electromagnetic waves, while cars convert chemical energy from gasoline into mechanical energy.
Step-by-step explanation:
Cell Phones: Cell phones work by converting electrical energy into electromagnetic waves. When you make a call or send a text, your phone converts the electrical signals from the battery into radio waves. These radio waves are then transmitted to a nearby cell tower, where they are converted back into electrical signals and sent to the recipient's phone.
Cars: Cars work by converting chemical energy from gasoline into mechanical energy. When you start the engine, the chemical energy in the gasoline is converted into thermal energy through combustion. This thermal energy expands the gas in the engine, producing mechanical energy that drives the car's wheels.