The First Law of Thermodynamics: Internal Energy, Heat, and Work

The video tutorial explains the first law of thermodynamics, focusing on the relationship between internal energy, work, and heat. It describes different processes like isovolumetric, isothermal, adiabatic, and isolated systems, and provides guidelines for sign conventions in calculations. An example calculation is given to illustrate energy transfer in a system.

What does the First Law of Thermodynamics primarily describe?

• The relationship between pressure and volume

• The conservation of mass

• The conversion of energy into matter

• The relationship between internal energy, work, and heat

In an isovolumetric process, what remains constant?

• Temperature

• Volume

• Pressure

• Internal energy

Which process involves no change in temperature?

• Isothermal

• Isolated

• Isovolumetric

• Adiabatic

What is true about an adiabatic process?

• There is no work done

• There is no change in internal energy

• There is no heat transfer

• There is no change in volume

In an isolated system, what is the change in internal energy?

• It increases

• It remains constant

• It decreases

• It fluctuates

When heat is absorbed by a system, what is the sign of Q?

• Undefined

• Zero

• Positive

• Negative

If 100 joules of work is done on a system and the internal energy increases by 74 joules, what happens to the remaining energy?

• It remains in the system

• It is stored as potential energy

• It is lost as heat

• It is converted to mass