Explanation of Amps

From: tuxtlequino (tuxtlequino_at_yahoo.com)
Date: 01/16/05 

Date: 15 Jan 2005 20:18:23 -0800

I am trying to learn more about electronic, but for some reason I
cannot fully Amps with the examples the book provided. I memorized
Ohm's law, and the formulas necesary to come up with the total
resistance in a circuit (either parallel or in a serie), but there is
still more questions that the book does not answer. Could somebody help
me with that please?

Here are my questions:

If E=IR can we just then increase the resistance and get as many volts
as we want?

The schematics in the book explains the number of volts (for example a
9 volt battery), but they never mention the amps in the battery, how
can we then figure out how much resistance do we need?

If I get a LED that says in the package 2 Volts, and .005amp. I
understand that I need to divide 7/.005 to figure out how much
resistance I need. But why .005? Where did it came from, why, what is
the resistance of the LED?

Now, if I have a system of 9 volts (I bought an electric kit with a
schematic explaning how it works!), and then there is a resistor for
4.7MOhms, what is my amperage? Would I use the same formula(e=ir) to
figure out? Does the use of capacitors change my amperage (I have seen
them in my circuit!)?

Relevant Pages

  • Re: Effect of the supply internal resistance
    ... In the circuit above the center point, which is kind of a reference point is ... there is 0.1V across I R (internal resistance of battery). ... provides 10.1 volts, and there will be 0.1 volts (in the opposite ...
    (sci.electronics.basics)
  • Re: Effect of the supply internal resistance
    ... In the circuit above the center point, which is kind of a reference point is ... there is 0.1V across I R (internal resistance of battery). ... provides 10.1 volts, and there will be 0.1 volts (in the opposite ... Assume that the unloaded battery voltage Ebat is 10.1 volts. ...
    (sci.electronics.basics)
  • Re: Explanation of Amps
    ... > resistance in a circuit, ... If you have a current source (that provides as many volts as it takes ... At any current or voltage, the ratio of volts divided by amperes is ...
    (sci.electronics.basics)
  • Re: Whats the real killer, voltage or amperage?
    ... here are saying that under 50 volts is non-lethal.I have heard a story ... also think of current as a bullet and voltage as the gunpowder. ... One might think of resistance as being like water ...
    (sci.electronics.design)
  • Re: PMOS in parallel with NMOS
    ... Connect 5 volts directly to the emitter. ... The 0 volts on the base is provided by a microcontroller pin. ... happens to come from an LM7805 voltage regulator. ... Maybe it's dropped in the internal resistance of the microcontroller ...
    (comp.arch.embedded)