First Law of Thermodynamics Video Lessons

Concept

# Problem: The first law of thermodynamics is usually written asQ=W+ΔU.You need to look at the signs carefully; some other disciplines (chemistry, for example) may use other signs, which implies other definitions of these quantities.1. Which physical law underlies the first law of thermodynamics?a) conservation of matterb) increase in entropyc) conservation of energyd) conservation of work2. The quantity Q is the __________ that is added to the system.a) heatb) workc) entropyd) internal energy3.The quantity W in the first law refers to the __________.a) work done on the systemb) work done by the systemc) change of energy in the systemd) change of volume in the system4. The quantity ΔU in the first law of thermodynamics is the change in the __________ of the system.a) entropyb) internal energyc) heat energyd) temperature

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The first law of thermodynamics emphasizes that energy cannot be created or destroyed.

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###### Problem Details

The first law of thermodynamics is usually written as

Q=WU.

You need to look at the signs carefully; some other disciplines (chemistry, for example) may use other signs, which implies other definitions of these quantities.

1. Which physical law underlies the first law of thermodynamics?

a) conservation of matter

b) increase in entropy

c) conservation of energy

d) conservation of work

2. The quantity Q is the __________ that is added to the system.

a) heat

b) work

c) entropy

d) internal energy

3.The quantity W in the first law refers to the __________.

a) work done on the system

b) work done by the system

c) change of energy in the system

d) change of volume in the system

4. The quantity ΔU in the first law of thermodynamics is the change in the __________ of the system.

a) entropy

b) internal energy

c) heat energy

d) temperature