Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > In purely resistive circuit, energy delivered...
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In purely resistive circuit, energy delivered by source is ____________ by resistance.
- a)dissipated in the form of heat
- b)stored as electric field
- c)stored as magnetic field
- d)returned to source
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In purely resistive circuit, energy delivered by source is ___________...
In purely resistive circuit, energy delivered by source is dissipated in the form of heat by resistance and is not stored as either electric field or magnetic field.
Most Upvoted Answer
In purely resistive circuit, energy delivered by source is ___________...
Understanding Energy Dissipation in a Resistive Circuit
In a purely resistive circuit, the energy delivered by the source is primarily dissipated as heat due to the resistance present in the circuit. This phenomenon can be explained through the following key points:
Energy Source and Resistance
- When an electrical source provides energy, it creates a flow of current through the resistive elements (like resistors) in the circuit.
- According to Joule's Law, the power (P) dissipated in a resistor is given by the equation:
P = I²R
where I is the current flowing through the resistor and R is the resistance.
Heat Generation
- As current flows through the resistance, the electrical energy is converted into thermal energy (heat) due to the collisions of charge carriers (electrons) with atoms in the resistor.
- This conversion of energy leads to an increase in temperature of the resistor, which is why resistors are often used in applications where heat generation is desirable.
Why Other Options Are Incorrect
- Stored as Electric Field: In capacitors, energy is stored as an electric field, not in resistors.
- Stored as Magnetic Field: Inductors store energy in a magnetic field, which is not applicable in purely resistive circuits.
- Returned to Source: Energy cannot be returned to the source in a resistive circuit; instead, it is permanently converted to heat.
Conclusion
In summary, in a purely resistive circuit, the energy delivered by the source is dissipated in the form of heat due to the resistance, making option 'A' the correct answer. Understanding this principle is essential in electrical engineering and circuit design.
In a purely resistive circuit, the energy delivered by the source is primarily dissipated as heat due to the resistance present in the circuit. This phenomenon can be explained through the following key points:
Energy Source and Resistance
- When an electrical source provides energy, it creates a flow of current through the resistive elements (like resistors) in the circuit.
- According to Joule's Law, the power (P) dissipated in a resistor is given by the equation:
P = I²R
where I is the current flowing through the resistor and R is the resistance.
Heat Generation
- As current flows through the resistance, the electrical energy is converted into thermal energy (heat) due to the collisions of charge carriers (electrons) with atoms in the resistor.
- This conversion of energy leads to an increase in temperature of the resistor, which is why resistors are often used in applications where heat generation is desirable.
Why Other Options Are Incorrect
- Stored as Electric Field: In capacitors, energy is stored as an electric field, not in resistors.
- Stored as Magnetic Field: Inductors store energy in a magnetic field, which is not applicable in purely resistive circuits.
- Returned to Source: Energy cannot be returned to the source in a resistive circuit; instead, it is permanently converted to heat.
Conclusion
In summary, in a purely resistive circuit, the energy delivered by the source is dissipated in the form of heat due to the resistance, making option 'A' the correct answer. Understanding this principle is essential in electrical engineering and circuit design.
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