Question regarding voltage, current and resistance

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SUMMARY

The discussion centers on the theoretical implications of zero resistance in electrical circuits, specifically addressing the behavior of current and voltage. It is established that while superconductors can exhibit zero resistance under specific conditions, current does not flow infinitely fast due to the finite speed of light. The relationship between voltage, current, and resistance is clarified through the equation V=IR, emphasizing that voltage can increase with resistance while maintaining a constant current. The analogy of friction in physical movement effectively illustrates these concepts.

PREREQUISITES
  • Understanding of Ohm's Law (V=IR)
  • Basic knowledge of superconductors and their properties
  • Familiarity with the concept of electrical resistance
  • Comprehension of the speed of light as a limiting factor in electrical systems
NEXT STEPS
  • Research the properties and applications of superconductors in electrical engineering
  • Explore the implications of the speed of light on electrical signal transmission
  • Study the effects of resistance on circuit performance and efficiency
  • Learn about advanced concepts in electromagnetism related to voltage and current
USEFUL FOR

Electrical engineers, physics students, and anyone interested in the principles of electricity and circuit design will benefit from this discussion.

Aichuk
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It's impossible for an object to have no resistance but I was wondering if theoretically such a thing was possible, shouldn't the current flow infinitely fast? But instead, no current exists at all (V=I*0=0). And if the current remains the same, how come the voltage increases as I increase resistance? I'm sorry for the stupid questions.
 
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Current is always limited to the speed of light.

In your equation (V=IR), V = 0 when R = 0, but I can be any number. Certain materials, called superconductors, have zero resistance as long as they remain sufficiently cooled. Think of voltage as work, and resistance as friction. If you push a box across the cement, you have to continuously push and do work on it because of the friction. The more friction there is, the more work you have to do to maintain the same speed. A box on a frictionless surface will continue to move at the same speed it started at without any work at all (assuming no air resistance). This is similar to the zero resistance, zero voltage scenario.
 
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