what is internal resistance?

Question

please explain in detail
(someone told me that it was the resistance between current and voltage is it true since current flows the same way electrons do which way is the voltage going + or -

Answer 1

Depends on how you are referring to current flow.

All conductors exhibit some minute internal resistance. Pure conductors are also called "superconductors" where I come from.

Dealing with AC electrical motors, you encounter inductive reactance, which is a form of resistance that doesn't show itself until you turn the motor on. Inductive reactance comes from the backward EMF that develops as magnetic fields expand and collapse arround stator coils in an AC motor or other AC wound wire component (like a lighting ballast).

Then there's capacitive reactance.......(a similar, but other story).

Then there's the internal resistance that happens as an element or conductor get hot. As conductive atoms get hot, they vibrate more vigorously, and it becomes more difficult for electrons to leap from atomic shell loci to loci, because the atoms hava become seriously "moving targets".

Now, you might be talking about diodes, but I doubt that. Diodes have electrical bias, conducting freely in one direction, but acting like a virual "wall" against conductivity in the other.

Answer 2

Voltage can be thought of as a force that a battery exerts on electrons.
Current is the number of electrons that pass through a given point on the wire each second.
Resistance is essentially friction. The more resistance in a circuit, the harder you have to push (higher voltage) to keep the same amount of current flowing.
There is said to be a "voltage drop" across a resistor (something which has resistance) when current is flowing through the resistor. The higher the resistance and the higher the current, the larger the voltage drop.

Internal resistance is the resistance of the internal components of a battery. If you have a 9-volt battery, that means it's rated at providing an electro-motive force of 9 volts when no current is flowing. However, once current is flowing in a circuit, the battery experiences internal resistance (friction), and its ability to generate force is reduce somewhat. A perfectly new 9V battery might generate 9 volts when not in a circuit, but when it's in a circuit and current is flowing, there might be -1 volts of internal resistance, so the battery is really only producing 8 volts.

Answer 3

Internal resistance is a very small, almost negligible resistance of a component.
example is the wire itself. Every wire has a resistance. If the wire shall we say the length is 10 m. the resistance is very small
another example is the capacitor. It holds the potential from one end to another end plate. The reading of its resistance is labeled in farad. The heating effect is the internal resistance which is not counted as its resistance.
is it OK?