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

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

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Electronic Principles
Which one of the following phrases best describes residual magnetism?

The force of attraction between the poles of a permanent and temporary magnetic field
The amount of magnetic flux that is not confined to the core material of an electromagnet
The circular magnetic field that surrounds a conductor carrying a current
None of these
Magnetism that remains in the core of an electromagnet after the current through the coil is turned off

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Electronic Principles
Which one of the following statements is true for current flowing in a parallel circuit?

The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance
The same current always flows through every part of a parallel circuit
None of these
The total current in a parallel circuit is always less than the smallest amount of current
The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it

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Electronic Principles
Which one of the following statements is true for the voltage in a parallel RC circuit?

The total voltage leads the total current by less than 90 degree
The voltage always has the same amplitude and phase for every part of the circuit
None of these
The total voltage is less than the sum of the voltages across the resistance and capacitance
The total voltage is equal to the sum of the voltages across the resistance and capacitance

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