But a few tires use millimeters for sizing. Also bear in mind that the sizes are not really precise. The 26 inch tire produced by manufacturers will have a few differences in fact. The mountain bike tire sizes stated here are those frequently used in the US. In other countries, they may use other systems.
There is another important property that can be measured in electrical systems. This is resistance, which is measured in units called ohms. Resistance is a term that describes the forces that oppose the flow of electron current in a conductor. All materials naturally contain some resistance to the flow of electron current. We have not found a way to make conductors that do not have some resistance. If we use our water analogy to help picture resistance, think of a hose that is partially plugged with sand. The sand will slow the flow of water in the hose.
Resistance is a measure of how hard it is for a current to flow through a component in a circuit. Resistors are added into a circuit to reduce the amount of current flowing. The bigger the value of resistance, the lower the current. Components such as bulbs have resistance. When more bulbs are added to a series circuit, resistance increases. This causes the current to decrease. Your web browser does not have JavaScript switched on at the moment. For information on how to enable JavaScript please go to the Webwise site.