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Yogita Ingle 6 years, 4 months ago
The laws of thermodynamics define the fundamental physical quantities like energy, temperature and entropy that characterise thermodynamic systems at thermal equilibrium. The laws represent how these quantities behave under various circumstances. The four laws of thermodynamics are given below:
The Zeroth Law is the basis for the measurement of temperature. It states that: Two bodies which are in thermal equilibrium with a third body are in thermal equilibrium with each other.
The first law of thermodynamics which is also known as the conservation of energy principle states that:
Energy can neither be created nor destroyed, but it can be changed from one form to another.
The second law of thermodynamics states that: Energy in the form of heat only flows from regions of higher temperature to that of lower temperature.
The Third Law states that: The entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 K)
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Yogita Ingle 6 years, 4 months ago
Electric potential difference is known as voltage, which is equal to the work done per unit charge to move the charge between two points against static electric field.
Voltage = work done/ charge
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Ron Vineetahuja 6 years, 4 months ago
Ariba _____ 6 years, 4 months ago
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Yogita Ingle 6 years, 4 months ago
Lenz’s law
- According to Lenz’s law:-The polarity of the induced emf is such that it tends to produce induced current in such a direction that it opposes the change in magnetic flux that produced it.
- The (-) ive sign in given equatione= (-) (dΦ/dt)tells about the direction.
- According to Faraday’s law whenever there is change in the magnetic flux, emf is induced, as aresult there will be induced current.
- According to Lenz’s law the direction of the induced current will be such that it opposes the change in the magnetic flux.
For example:-
- Consider a circuit where the magnetic flux is increasing, as a result flux will change and which induces the emf in the circuit, and as a result current will be induced in the circuit.
- The direction of the induced current will be such that it will oppose the cause which induced it.
- The induced current will be in such a direction that it decreases the magnetic flux.
Posted by Shruti Saraogi 6 years, 4 months ago
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Ariba _____ 6 years, 4 months ago
Vikas Semwal 6 years, 4 months ago
Yogita Ingle 6 years, 4 months ago
Eddy currents
- Eddy currents are induced currents in the body of conductor when subjected to changing magnetic flux.
- They are also known as Foucault current after the name of the scientist Foucault.
- They are known as eddy currents as they are in the pattern of eddiesin the water.
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Yogita Ingle 6 years, 4 months ago
The SI unit of current is ampere which measures the flow of electric charge across a surface at the rate of one coulomb per second. Since the charge is measured in coulombs and time in seconds, so the unit is coulomb/Sec (C/s) or amp.
Posted by Anil Kumar 6 years, 4 months ago
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