Generically, the opposition to electric current is referred to as impedance. Impedance comes in two parts, called resistance and reactance. Resistance impedes the flow of current by converting electrical energy into heat; in other words, a resistance is something that dissipates power. read more
They oppose current flow, in another way called ‘Reactance’, symbol X. The combination of resistance and reactance is called impedance, symbol Z. For inductors or capacitors, |X| = E/I, where the ‘bar brackets’ || mean ‘size of’. read more
Voltage is the pressure that pushes current through the resistance of the conductor. Ohm's Law: E=IR can be rewritten as I=E/R to explain this. read more