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Questions and Answers
What is the primary statement of the First Law of Thermodynamics?
What is the primary statement of the First Law of Thermodynamics?
What is the main characteristic of an isolated system?
What is the main characteristic of an isolated system?
What is the unit of electric field?
What is the unit of electric field?
What is the primary characteristic of entropy?
What is the primary characteristic of entropy?
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What is the unit of electric potential?
What is the unit of electric potential?
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What is the primary characteristic of a closed system?
What is the primary characteristic of a closed system?
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What is the direction of electric field lines around a positive charge?
What is the direction of electric field lines around a positive charge?
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What is the unit of magnetic field?
What is the unit of magnetic field?
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Study Notes
Thermodynamics
Laws of Thermodynamics
- Zeroth Law: If two systems are in thermal equilibrium with a third system, they are also in thermal equilibrium with each other.
- First Law: Energy cannot be created or destroyed, only converted from one form to another.
- Second Law: The total entropy of an isolated system always increases over time, except in reversible processes.
- Third Law: As the temperature of a system approaches absolute zero, the entropy of the system approaches a minimum value.
Thermodynamic Systems
- Closed System: A system that does not exchange matter with its surroundings, but can exchange energy.
- Open System: A system that exchanges both matter and energy with its surroundings.
- Isolated System: A system that does not exchange matter or energy with its surroundings.
Thermodynamic Properties
- Internal Energy (U): The total energy of a system, including kinetic energy, potential energy, and potential energy associated with the interactions between particles.
- Enthalpy (H): A measure of the total energy of a system, including internal energy and the energy associated with the pressure and volume of a system.
- Entropy (S): A measure of the disorder or randomness of a system.
Electromagnetism
Electric Charges and Fields
- Positive and Negative Charges: Like charges repel, opposite charges attract.
- Electric Field (E): A vector field that surrounds charged particles, with units of N/C.
- Electric Field Lines: Imaginary lines that emerge from positive charges and enter negative charges.
Electric Potential
- Electric Potential (V): The potential energy per unit charge, with units of J/C.
- Electric Potential Difference (ΔV): The difference in electric potential between two points, also known as voltage.
Magnetism
- Magnetic Fields (B): A vector field that surrounds currents and magnetic dipoles, with units of T.
- Magnetic Field Lines: Imaginary lines that emerge from the north pole and enter the south pole of a magnet.
Electromagnetic Induction
- Faraday's Law of Induction: A changing magnetic flux through a loop of wire induces an electric field.
- Lenz's Law: The direction of the induced current is such that it opposes the change in the magnetic flux.
Electromagnetic Waves
- Electromagnetic Spectrum: A range of frequencies, including gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves.
- Electromagnetic Wave Propagation: Electromagnetic waves can travel through a vacuum, with electric and magnetic fields perpendicular to each other and the direction of propagation.
Thermodynamics
Laws of Thermodynamics
- If two systems are in thermal equilibrium with a third system, they are also in thermal equilibrium with each other, according to the Zeroth Law.
- Energy cannot be created or destroyed, only converted from one form to another, as stated by the First Law.
- The total entropy of an isolated system always increases over time, except in reversible processes, as described by the Second Law.
- As the temperature of a system approaches absolute zero, the entropy of the system approaches a minimum value, according to the Third Law.
Thermodynamic Systems
- A Closed System does not exchange matter with its surroundings, but can exchange energy.
- An Open System exchanges both matter and energy with its surroundings.
- An Isolated System does not exchange matter or energy with its surroundings.
Thermodynamic Properties
- Internal Energy (U) is the total energy of a system, including kinetic energy, potential energy, and potential energy associated with the interactions between particles.
- Enthalpy (H) is a measure of the total energy of a system, including internal energy and the energy associated with the pressure and volume of a system.
- Entropy (S) is a measure of the disorder or randomness of a system.
Electromagnetism
Electric Charges and Fields
- Positive and Negative Charges interact with each other, with like charges repelling and opposite charges attracting.
- An Electric Field (E) is a vector field that surrounds charged particles, with units of N/C.
- Electric Field Lines are imaginary lines that emerge from positive charges and enter negative charges.
Electric Potential
- Electric Potential (V) is the potential energy per unit charge, with units of J/C.
- Electric Potential Difference (ΔV) is the difference in electric potential between two points, also known as voltage.
Magnetism
- Magnetic Fields (B) are a vector field that surrounds currents and magnetic dipoles, with units of T.
- Magnetic Field Lines are imaginary lines that emerge from the north pole and enter the south pole of a magnet.
Electromagnetic Induction
- Faraday's Law of Induction states that a changing magnetic flux through a loop of wire induces an electric field.
- Lenz's Law states that the direction of the induced current is such that it opposes the change in the magnetic flux.
Electromagnetic Waves
- The Electromagnetic Spectrum is a range of frequencies, including gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves.
- Electromagnetic Wave Propagation occurs through a vacuum, with electric and magnetic fields perpendicular to each other and the direction of propagation.
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Test your understanding of the zeroth, first, second, and third laws of thermodynamics, including thermal equilibrium, energy conversion, entropy, and more!