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:

armature
commutator
battery
rotor
None of these

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Electronic Principles
The peak value of a sine waveform is:

the maximum positive or negative value
the amplitude at 90% of the maximum value
None of these
the amplitude at 70.7% of the maximum value
the amplitude at 1.41 times the maximum value

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