Page 20 - DJJ20063- Thermodynamics 1

DJJ20063- Thermodynamics 1

• Ocean thermal power (Heat → Electricity)

• Hydroelectric dams (Gravitational potential energy → Electricity)

• Electric generator (Kinetic energy or Mechanical work → Electricity)

• Fuel cells (Chemical energy → Electricity)
• Battery (electricity) (Chemical energy → Electricity)

• Fire (Chemical energy → Heat and Light)

• Electric lamp (Electricity → Heat and Light)

• Microphone (Sound → Electricity)
• Wave power (Mechanical energy → Electricity)

• Windmills (Wind energy → Electricity or Mechanical energy)

• Piezoelectrics (Strain → Electricity)

• Acoustoelectrics (Sound → Electricity)
• Friction (Kinetic energy → Heat)

1.7 The Zeroth Law of Thermodynamics

This law states that if object A is in thermal equilibrium with object B, and object B is in
thermal equilibrium with object C, then object C is also in thermal equilibrium with object

A.

This law allows us to build thermometers. For example the length of a mercury column

(object B) may be used as a measure to compare the temperatures of the two other
objects.

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