Principles of electricity-Ohm's Law

Voltage: It is "the force" with which the positive pole attracts electrons from the negative pole.  It is measured in volts. For example, a single battery has 1.5 V, a flask battery has 2.5 V and a rectangular battery has 9V.

Intensity: It is the flow of electrons that crosses a section of the conduits. It is measured in amperes. 1 Ampere is 1 Coulomb/second, where 1 Coulomb is a package of 6.25x10^18 electrons.

Resistance: They are elements that interrupt more (1 MOhm) or less (1 Ohm) the electric current.
The relationship between these concepts is given by Ohm's Law:

I= V/R

For the example on the left/up:

• V= 9 volts
• R=1000 Ohms
• I= V/R = 9/1000 = 0.009A = 9 mA

For the example on the right/down:

• V= 9 volts
• R=100 Ohms
• I= V/R = 9/100 = 0,09A = 90 mA

The results are slightly lower due to losses in contacts and cables.

Click here to see the first circuit

Click here to see the second circuit