used this: https://www.youtube.com/watch?v=mc979OhitAg
everything is made of atoms.
atoms contain electrons, that are loose in conductive materials (such as metal). in a closed circuit, electrons flow from positive to negative terminals to generate an ‘electric-flow’, or current. tom also said, in ipc_class-1, that electricity always moves from ‘high’ (voltage) to ‘low’ (ground (gnd)) areas.
voltage:
pushing force of electrons in a circuit. this is generated by a power source, such as a battery. this means that the power source (or between point-a to point-b) can send electrons with a certain force (the potential energy of the circuit). measured in volts.
also expressed as:
volt - joules (heat) / colomb (group of electrons (6.25 × 10^18 electrons.))
current:
flow of electrons through a conductor. a circuit can afford to push x electrons, but how much is actually flowing between two points? this, as i understand it, is the conversion of potential energy to kinetic energy. measured in amperes, where 1 ampere = 1 coulomb (which is ~6.25 × 10^18 electrons).
also expressed as:
1 amp = 1 coulomb
resistance:
opposition to current flowing in a circuit. this is usually created by intentionally or unintentionally (because every material has some resistance) causing collisions of electrons, and getting them to expend heat. air has resistance, but an infinitely higher one, and therefore does not allow any current to pass through the conductive-points it touches. a resistor on the other hand has a lower resistance, and, therefore, allows some current to pass through.
electricity can also produce magnetic-fields, with electromagnetism.