What variables are represented by the formula for the first law of thermodynamics? Check all that apply.internal energychemical energyelectrical energyheatwork

The first law of thermodynamics relates a system’s change in internal energy to heat and work, commonly written as ΔU = Q − W (depending on the sign convention). Thus, the represented variables are internal energy, heat, and work. Chemical energy and electrical energy are not separate variables in this formula.

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