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Author Question: A simple electric doorbell probably uses ________ to ring the bell. A) an electromagnet B) ... (Read 22 times)

AEWBW

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on: Jul 28, 2018
A simple electric doorbell probably uses ________ to ring the bell.
 
  A) an electromagnet B) transistor
  C) a DPDT switch D) a permanent magnet

Question 2

A relay is a device that ________.
 
  A) isolates the actuating signal from the control signal
  B) uses an electromagnet to open and close contacts
  C) has a coil to actuate some contacts that control other circuits
  D) all of these


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ergserg

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Reply #1 on: Jul 28, 2018
Answer to Question 1

A

Answer to Question 2

D


AEWBW

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Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

xiazhe

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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