Question

Tracy makes a list of energy transformations that occur as an engine runs to power a car.

1. Chemical energy transforms into thermal energy.
2. Thermal energy transforms into electrical energy.
3. Chemical energy transforms into gravitational potential energy.
4. Thermal energy transforms into kinetic energy.

Which transformation should Tracy remove from the list?

1
2
3
4

Answer 1

2

Thermal energy from combustion is converted into mechanical work (which can then drive an alternator to produce electricity). It’s not correct to say thermal energy directly transforms into electrical energy in a car engine.