Electronic Principles
A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?

410 Ohm
None of these
400 Ohm
310 Ohm
550 Ohm

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

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

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