Question

energy efficiency = useful energy output/total energy input × 100 (%) if a power plant uses 100 units of energy to create electricity and the useful output is 5 units, what happens to the other 95% of the energy input? its lost mostly as heat. its lost as a gas. its lost as a liquid.

Explanation:

In energy conversion processes like power plants, the majority of wasted energy is dissipated as thermal energy (heat) due to inefficiencies in machinery, friction, and thermodynamic limits, which aligns with the 95% unused energy here. The other options (loss as gas/liquid) do not represent the primary form of energy loss in electricity generation.

Answer:

It's lost mostly as heat.