Energy carried by current

Answer 1

For DC: power (in watts) = current (in ampere) x voltage (in volts).

Energy = power x time, so energy = current x voltage x time (time in seconds).

For AC, a power factor may have to be included (the cosine of the angular displacement between current and voltage). This is often near one, but it may be less.

Answer 2

Electric current carries energy in the form of electrical potential energy, which is the energy required to move electrons through a conductor. This energy can be harnessed and converted into other forms, such as heat, light, or mechanical energy, depending on the application.

Answer 3

By definition, an electric circuit allows electric current to flow from a source of current and back around to that source in a complete circuit, rather like water from a pump outlet flowing round a pipe back to the pump inlet in a circulating system. The electric current may flow in only one direction at all times (direct current, or pumping in only one direction) or may change direction periodically (alternating current, or reversing the pump periodically).