Ohm's Law, Volts, Amps, Watts.

Let's imagine we have Garry chugging along in one of his electric models on a 1 Volt battery.
His motor puts up a resistance of 1 Ohm so it pulls a current of 1 Amp.
He's now using power (energy) at the rate of 1 Watt.
This is normal for Garry, but what would happen if he changed his battery to 2 Volts?

Look back at the triangle in post 11
He now has 2 Volts pushing on a 1 Ohm resistor (the same motor) so the current flow will go up to 2 Amps.
He's doubled the Voltage so you may expect double the power ..... but he's also doubled the current flow (Amps) ... so you can expect double the power again.

This is exactly what happens.
The simple way to work out the power is to multiply the Volts by the Amps.....
In this case 2 Volts X 2 Amps = 4 VA .... VA is another way of saying "Watts" (W)

We can bring in another triangle similar to the last one here.
P, is the power in Watts... V, is the Voltage .... I, is the induced current in Amps.

If you do a bit of head scratching you'll find that you can make up some more formulae to do these calculations. .... You can calculate the power by squaring the current and multiplying by the resistance..... I² X R = W

looks like I,m goner struggle cant keep things in my head ie lack of memory = dunce

have to keep asking lol

andy_mann wrote: have to keep asking lol

Just ask away Andy ... you'll get the hang of it.
It's only tricky getting started.

Pol.

but Vaseline doesn't help, here! (It will help to stop your terminals from oxidizing, though!)

Pol - I'd make this series a sticky so it won't vanish into oblivion, and if you feel so inclined, carefully remove these trivial comments as you go!

Something useful I've stumbled across while looking for antenna data - it might be useful to someone else.
Pol, copy and paste, or move it to another thread if you wish.

frequency to wavelength conversion calc. =

www.onlineconversion.com/frequency_wavelength.htm

or

www.convertalot.com/wavelength_calculator.html

Eric wrote:
Pol - I'd make this series a sticky so it won't vanish into oblivion, and if you feel so inclined, carefully remove these trivial comments as you go!

I don't mind a few trivial comments Eric, the thread is supposed to be a bit of fun.

If the category expands into several threads covering various subjects then we'll have a tidy up & move posts to the correct thread.

Pol.

Hydrogen is a poor conductor of electricity but for the purpose of understanding how electrons leap frog from one atom to the next it looks quite simple.
If you couldn't understand the previous diagram then try this one.
Hydrogen doesn't have any neutrons .... Don't blame me, I didn't take them. :whistle:
It's a cheapskate atom with just one proton & one electron.
The reason it's not a good conductor is because it's hard to separate the electron from it's proton, in fact it's easier to separate the monks from the boys in a monastery.

Never the less just use your imagine this is a 1 atom thick piece of wire connected to a battery.

The negative terminal pushes out an electron as the positive terminal steals one from the other end of the wire.

Has anyone got a problem with this up to now?
If you have then please say so or PM me, there's not much point in going on if you've hit a hurdle.
I'm going to move on from here & start dealing with the difference between AC & Dc .. Any member that swings both ways should look up the "Monty Python" Bruce sketch...NO POOFTERS!:lol:
I'm not homophobic but I can't bend over backwards to please everybody. :whistle:

No prob at this end Pol, its as clear as mud:) . Joking of course, carry on as I find it hard but interesting

Garry

Hang in there Phil, you haven't lost me yet.

I might have jumped the gun a bit here. I haven't covered resistors in series & parallel yet.
I know the same rules will apply to AC & DC but maybe I should cover this before we move on.

Pol.

Here's a simple circuit diagram of two resistors in series.
The bit with a "V" by it is a battery ... the two zig zags that resemble Garry's landing flight path are resistors.
If R1 is 10 Ohm & R 2 is 5 Ohm the the total resistance in the circuit is 15 Ohm.

This one is easy isn't it? .... It doesn't matter how many resistors there are... just add all the values together if they are wired like this.

So that's R3, then?? (duh!) What value was R.
This is like those allgibberish questions they used to throw at you in maths, - if a + c = q, what is z?
How the f do I know!

The fun starts when you get two or more dissimilar resistors in parallel! (side by side!)

Eric wrote:
The fun starts when you get two or more dissimilar resistors in parallel! (side by side!)

Like Eric says, what happens in this case? :woohoo:

You didn't say whether they were all the same impedence, or different - if all the same the impedence is for one, but three times the current capacity