Definition
Electric Current has two properties, the Heating effect, and the Magnetic Effect of Electric Current. Why? The energy expended by the source is dissipated in the form of heat in the resistors.
Joule’s Law of heating
The law implies that heat produced in a resistor is:
- Directly proportional to the square of current for a given resistance
- Directly proportional to resistance for a given current
- Directly proportional to the time for which the current flows through the resistor.
Derivation
Since heat is a form of energy, from the equation for Power,
Again, variations can be:
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Flashcards
Why is there a heating effect of electric current? ? The energy expended by the source is dissipated in the form of heat in the resistors.
What does Joule’s Law of Heating imply? ? The law implies that heat produced in a resistor is:
- Directly proportional to the square of current for a given resistance
- Directly proportional to resistance for a given current
- Directly proportional to the time for which the current flows through the resistor.