Find Amperage knowing # electrons and time

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SUMMARY

The discussion centers on calculating current (I) using the number of electrons (4.4E21) passing through a resistor over a specified time (5 minutes). The user, Brad, attempts to use the formula I = delta(Q)/delta(t) but arrives at an implausible value of 1.5E19 Amps. Daniel prompts Brad to consider the relationship between electrons and Coulombs, emphasizing the need to convert the number of electrons to Coulombs to derive the correct current value.

PREREQUISITES
  • Understanding of basic electrical concepts, including current, voltage, and resistance.
  • Familiarity with the formula I = delta(Q)/delta(t) for calculating current.
  • Knowledge of the charge of an electron (approximately 1.6E-19 Coulombs).
  • Ability to convert time units from minutes to seconds for calculations.
NEXT STEPS
  • Research how to convert the number of electrons to Coulombs using the charge of an electron.
  • Learn about Ohm's Law and its application in electrical circuits.
  • Explore the relationship between charge, current, and time in electrical systems.
  • Investigate common mistakes in calculating current from electron flow and how to avoid them.
USEFUL FOR

Students studying physics or electrical engineering, educators teaching circuit theory, and anyone needing to understand the relationship between charge, current, and time in electrical calculations.

Cyrad2
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Hi, I've been having some problems with a homework question. In the problem it tells me the resistance of a resistor, and how many electrons pass through it in a given time. t = 5min. #e = 4.4E21. I need to find V.

So, I need to find I since I know R.

How do I do this? The only formula I could find was I = delta(Q)/delta(t). This gives me a huge value for I along the lines of 1.5E19, which can't be right, can it?

Thanks a bunch,
Brad
 
Physics news on Phys.org
Look at the units of Amps.
Coulombs per sec
How many electrons are in a Coulomb?
 
What's with "1.5E19"...?What does it mean...?

Daniel.
 

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