Ohm's Law: Resistance, Voltage, & Current

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SUMMARY

This discussion clarifies fundamental concepts of Ohm's Law, specifically addressing current flow, resistance, and the behavior of resistors in a circuit. Current is conventionally described as flowing from positive to negative, although in metallic conductors, electrons are the actual charge carriers. One ohm of resistance does not block voltage; instead, it reduces current in a circuit. In a series DC circuit, the total voltage across resistors equals the source voltage.

PREREQUISITES
  • Understanding of basic electrical concepts, including voltage, current, and resistance.
  • Familiarity with Ohm's Law and its mathematical representation (V = IR).
  • Knowledge of series and parallel circuit configurations.
  • Awareness of electron flow versus conventional current flow.
NEXT STEPS
  • Study the implications of Ohm's Law in real-world applications.
  • Learn about Kirchhoff's Voltage Law and its relationship with Ohm's Law.
  • Explore the characteristics of resistors in both series and parallel circuits.
  • Investigate the role of semiconductors and how they differ from metallic conductors.
USEFUL FOR

This discussion is beneficial for electrical engineering students, educators teaching physics concepts, and anyone seeking to deepen their understanding of circuit behavior and Ohm's Law.

DrDanger
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Currnet flows from positive to negative right? cause you assume the path a proton would take?! also how much resistance does one ohm provide? does it block 1 volt? and resistors increase voltage and decrease current right? thanks!
 
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DrDanger said:
Currnet flows from positive to negative right? cause you assume the path a proton would take?!

Sorta, but no. There is a convention of positive current flow, in reality electrons are the current carriers in metallic conductors. You can use either negative or positive current flow, all is the same except for signs. Protons do not move as current in metallic conductors, they form the crystalline lattice which the electrons move through.

also how much resistance does one ohm provide?

Ummmm... 1 ohm!
Since ohms is the units for resistance there cannot be any other answer.

does it block 1 volt? and resistors increase voltage and decrease current right? thanks!

Resistance does not increase voltage. It does reduce current.

In a simple series DC circuit the sum of the voltages of the resistors equals the voltage of the source.
 

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