All electrical and electronic devices exploit the fact that electrons have a tendancy to go from a point of greater elecrical energy, to a point of lesser electrical energy. You provide a 'Positive' connection (of greate energy) and a 'negative' connection (of less energy) and a 'Conductor' through which the electrons flow.
Electrical energy, ALWAYS follows the path of least resistance to the ground. The better the conductor, the easier it is for the electrons to flow. The point of lowest electrical energy, is the Earth itself, which is where we get the term, Ground!
A circuit is a closed loop containing a source of electrical energy (battery) and a load (light bulb), The light bulb simply resists the flow of that electrical energy, converting it into light and heat. In a WELL DESIGNED circuit, all the electrical energy gets converted into some form of energy by devices such as a light bulb or LED etc...
The combination of CURRENT and VOLTAGE is called ELECTRICAL POWER.... or WATTAGE, and it is measured in Wattage.
The relationship is straightforward; Watts = Volts x Amps
E.g. a 120 watt light bulb would need 1 Amp @ 120 volts/2
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