Internal energy can be increased by ; A , C
- Transferring heat from the surroundings to the system and ( A )
- Doing work on the system ( C )
The Internal energy of a system is energy developed within the confines of the system and it is used to carryout tasks requiring energy in the system as well.
For a system to obtain some internal energy, work must be carried/done on the system by the occupants of that system, or energy can be transferred from the environment into the system in the form of heat.
When heat/energy leaves a system it is termed external energy and not internal energy.
Hence we can conclude that the internal energy can be increased by transferring heat from the surroundings to the system and doing work on the system.
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