A heat engine takes in 1200 j of heat from the high-temperature heat source in each cycle, and does 400 j of work in each cycle. what is the efficiency of this engine?

A device created to transform one or more sources of energy into mechanical energy is known as an engine or motor.
Potential energy, heat energy, chemical energy, electric potential, nuclear energy, and energy from the Earth's gravitational field are some of the energy sources that are currently available (from nuclear fission or nuclear fusion).
Heat engines are particularly important because many of these processes use heat as an intermediary energy source.
Atmospheric convection cells are one example of a natural process that transforms environmental heat into motion (e.g. in the form of rising air currents).

Temperature is a numerical expression of how hot a substance or radiation is.
There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are defined by practical empirical properties of particula rather than theoretical principles.

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