Energy can be transferred to a system by:

Explanation

Heat is the transfer of thermal energy between a system and its surroundings due to a temperature difference. When heat is added to a system, its internal energy increases, leading to changes in temperature, phase transitions, and other thermodynamic effects. Heat transfer can occur through conduction, convection, or radiation. The symbol commonly used for heat is "Q." Work is the transfer of mechanical energy to or from a system through the application of a force over a distance. Work can be done on a system (positive work) or by a system (negative work), and it can take various forms, such as mechanical work, electrical work, or expansion work. The symbol commonly used for work is "W."