Electronic Principles
Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?

5 Ohm
50 Ohm or more
6 Ohm
100 Ohm
None of these

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

The total voltage of a series circuit is equal to the total current divided by the total resistance
The total voltage in a series circuit is always less than the value of the smallest voltage
The total voltage in a series circuit is equal to the average value of the individual voltages
The total voltage is equal to the sum of the individual voltages in a series circuit
None of these

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
frequent changes in the direction of current through the coil causes heating effects in the core material
None of these
the core is permitted to move freely within the coil
an increase in current through the coil causes no further increase in the mmf

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