Watt is unit of power (J/s). Kilowatt-hour is energy (power × time). Joule is SI unit of energy. Electron volt is energy unit (1.6×10⁻¹⁹ J). Remember: power = energy/time. So watt is not energy.
Explanation:
Convection: movement of fluid due to density differences caused by temperature. Hot fluid rises, cold sinks, creating currents. Land/sea breeze, trade winds. Conduction in solids primarily.
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