Question

which best describes a difference between energy transformations in power plants and dams?
only power plants use fossil fuels to transform energy.
only dams use fission to generate thermal energy.
only power plants use water to turn turbines.
only dams use mechanical energy to produce electricity

Explanation:

1. Analyze Option 1: Power plants (like fossil - fuel power plants) use fossil fuels (coal, oil, natural gas) to transform energy (chemical energy to thermal to mechanical to electrical). Dams use water (hydropower) and don't use fossil fuels for energy transformation.
2. Analyze Option 2: Dams use the mechanical energy of water, not fission (fission is used in nuclear power plants for thermal energy generation).
3. Analyze Option 3: Dams also use water to turn turbines (hydro - turbines), so this is incorrect.
4. Analyze Option 4: Power plants (e.g., fossil - fuel or nuclear) can also use mechanical energy (from turbines driven by steam, which is thermal energy converted to mechanical) to produce electricity. Dams use mechanical energy of water, but power plants can too.

Answer:

A. Only power plants use fossil fuels to transform energy.