Electronic Principles
What is the smallest number of polarities required for current flow?

Two - a negative terminal and a positive terminal
One - a negative terminal
None of these
Three - negative, positive and neutral terminals
Four - two negative and two positive

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Electronic Principles
Current is

An imbalance of electrical charges
The force that causes electrons to flow
The flow of charged particles through a material
The number of free electrons in an atom
None of these

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