Category: 4. Resistance

What Is Ohm’s Law Ohm’s law is the relationship between voltage, current and resistance and how they relate to each other. Ohm’s law was developed by a German physicist named Georg Ohm who undertook many experiments to develop his theory including measuring current by touching electrical circuits to see how much it hurt. The higher…

An ideal conductor would be made from a material which posed no resistance to the flow of electrons. In the real world though, all materials will give some level of resistance, the level of resistance can also vary within the conducting material used. Some of the things which vary a conductors level of resistance are listed…

Resistance is measured in the SI units of Ohm’s which is represented with the Greek letter omega Ω. Materials are tested for their level of resistance by measuring the amount of current that passes across the conductor. An instrument for measuring resistance is called an ohmmeter.

What is resistance? Resistance is the opposition to the flow of electrons in a circuit through a conductor. In the illustration below, electrons flow in a synchronized and orderly manner. In reality the atoms will not be aligned so well and they will also vibrate tiny amounts causing electrons to collide. As the electrons collide they…