An electric fan is switched on. Its blades rotate and move air. The table shows the energy transfers over a short interval while the blades are already rotating at a constant speed.
| Energy transfer | Energy |
|---|---|
| Energy supplied to the fan | 600 J |
| Energy transferred to the kinetic store of the moving air | 180 J |
Give the energy transfer pathway from the rotating fan blades to the moving air.
Calculate the amount of energy transferred to stores other than the kinetic store of the moving air.
A student says that the energy not transferred to the kinetic store of the moving air has been destroyed. Explain why this is incorrect and state where this energy is stored.