What minimum value of series resistance is required when three 10-watt, 10-volt, 1000-mA zener diodes are connected in series to obtain a 30-volt regulated output from a 45 volt d.c. power source ? R E₁-45 V Eo=30 V ļ O 30 ohm O 15 ohm O 35 ohm O 550hm

What minimum value of series resistance is required when three 10-watt, 10-volt, 1000-mA zener diodes are connected in series to obtain a 30-volt regulated output from a 45 volt d.c. power source ? R E₁-45 V Eo=30 V ļ O 30 ohm O 15 ohm O 35 ohm O 550hm

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter3: Determining The Required Number Of Branch Circuits, Lighting Outlets, And Receptacle Outlets

Section: Chapter Questions

Problem 14R: How is the load determined for outlets supplying specific appliances? See NEC 220.14....

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Concept explainers

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

Question

What minimum value of series
resistance is required when three
10-watt, 10-volt, 1000-mA zener
diodes are connected in series to
obtain a 30-volt regulated output
from a 45 volt d.c. power source ?
R
E₁-45 V
Eo=30 V
ļ
O 30 ohm
O 15 ohm
O 35 ohm
O 550hm

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