EMFs, Battery & Resistor: Heat, Work & Energy Loss

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SUMMARY

The discussion centers on the energy loss in electrical circuits, specifically addressing the equation for heat release, i²RT. It establishes that while the battery provides energy to the circuit, the resistor is primarily responsible for the heat generated due to collisions between drifting current electrons and the vibrating metal lattice atoms. The work done by the battery, calculated as emf times charge, converts electrical energy into heat when the circuit is purely resistive. This highlights the dual role of the battery in supplying energy and the resistor in dissipating it as heat.

PREREQUISITES
  • Understanding of Ohm's Law and electrical circuits
  • Familiarity with the concept of electromotive force (emf)
  • Knowledge of free electron theory in conductors
  • Basic principles of energy transfer and heat generation in resistive materials
NEXT STEPS
  • Study the derivation and implications of the equation i²RT in electrical engineering
  • Explore the relationship between emf and energy conversion in circuits
  • Learn about the free electron theory and its application in understanding resistive heating
  • Investigate the thermal management techniques in electronic circuits to mitigate heat loss
USEFUL FOR

Electrical engineers, physics students, and anyone interested in understanding energy loss mechanisms in resistive circuits.

atavistic
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When we say heat released in a circuit is i^2 RT , who/what is the cause of this energy loss; is it the battery mechanism? Since work done on charge in the circuit by E field is zero, the only other force seems to be the battery mechanism, right? But in textbooks there is so much implication that the resistor is the root cause of heat, I am confused.
 
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The work done by the battery = emf times charge.The electrons pick up energy in the battery and convert this to other forms of energy in the circuit.If the circuit is resistive only heat is generated.In terms of free electron theory this can be explained in terms of the drifting current electrons continually colliding with the vibrating metal lattice atoms and transferring some of their energy with each collision.
 

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