Examlex
The figure below shows how the space density of a particular astronomical object depends on cosmic time.What kind of object does it show?
Armature
The rotating part of an electric generator or motor that interacts with the magnetic field to produce or use electricity.
Series
A connection of electrical components in a circuit end-to-end such that there is only one path for current flow, leading to the same current through all components.
Two-phase Power System
A two-phase power system is an electrical power distribution method that uses two alternating currents, which are offset in phase by one-quarter of a cycle (90 degrees).
Phase
A measure of the position of a point in time on a waveform cycle, often used in the context of alternating currents to describe the difference in timing between two waveforms.
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