Electronic Principles
The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the:

None of these
battery
rotor
commutator
armature

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Electronic Principles
A farad is defined as the amount of capacitance necessary for:

storing 1 V for 1 second
causing an ac phase shift greater than 90 degree
changing the voltage on the plates at the rate of 1 V per second when 1 A of current is flowing
dissipating 1 W of power
None of these

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