Some of this material is presented in other parts of this site, but is collected here in one spot for your convenience. Basic Electronic Definitions you should know The basic medium of exchange is an electron. When a whole bunch get together with a destination in mind it is called voltage. Voltage is the pressure that causes the electrons want to flow. When the electrons move, it is called current.
Resistance is the restriction to current's flow.
More voltage pressure will result in more current flow for a given resistance restriction. Flowing current causes magnetic fields. Magnetic force is proportional to the current flow, ignoring non-ideal effects. Magnetic force causes valve spool and electric motor movement. Just as forcing fluid through a restriction generates heat, forcing current through resistance also generates heat.