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Updated on 02nd March, 2023 , 2 min read
Joule heating, also known as Joule's law, is the process by which resistance in a circuit transforms electric energy into heat energy. In 1840, the English physicist James Prescott Joule discovered that the amount of heat generated per second in a wire carrying a current is proportional to the electrical resistance of the wire and the square of the current. He calculated that the heat evolved per second equals the electric power absorbed, or power loss.
The first law of joule shows the relationship between heat produced by flowing electric current through a conductor.
Formula:
Q = I2 R T
According to Joule's second law, the internal energy of an ideal gas is independent of volume and pressure, and only depends on temperature. Magnetostriction is a ferromagnetic material property that causes it to change shape when exposed to a magnetic field.
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Joule’s law has numerous practical applications in transportation, the home, and industry. Forexaple, light blubs, iron, oven, etc
The main disadvantage of Joule’s effect is the energy lost when it is converted into heat and when electrical appliances overheat. Joule’s law is undesirable in many applications because some electronic devices require a heat sink to prevent excessive heating of the various components and devices.
In electricity, Joule heating, also known as Joule’s law, is the conversion of electric energy into heat energy by the resistance in a circuit.
According to Joule’s Law, H (Heat) = I (Current) x V (Voltage) x T (Time the current is allowed to flow). Alternatively, H (Heat) = I2 (Current squared) x R (Resistance) x T (Time the current is allowed to flow).
The SI unit for energy is the joule (J): 1 J=1 newton metre (N m).
The number of joules equal to one calorie is defined as the Joule constant J. This constant is also known as the "mechanical equivalent of heat," because early experiments typically involved the conversion of mechanical energy to heat.
The joule’s first law shows the relationship between heat produced by flowing electric current The relationship between heat produced by flowing electric current through a conductor is demonstrated by the joule’s first law. Q = I2 R T.
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