This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A simple electric doorbell probably uses ________ to ring the bell. A) an electromagnet B) ... (Read 21 times)

AEWBW

  • Hero Member
  • *****
  • Posts: 579
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


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ergserg

  • Sr. Member
  • ****
  • Posts: 338
Reply #1 on: Jul 28, 2018
Answer to Question 1

A

Answer to Question 2

D


AEWBW

  • Member
  • Posts: 579
Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

momolu

  • Member
  • Posts: 320
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

« previous next »
 

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates's recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

electromagnet electromagnet
Simple squamous epithelium Simple squamous epithelium
A Simple Model of the Learning Process A Simple Model of the Learning Process
Stethoscope with both a bell-shaped and flat-disc amplifier Stethoscope with both a bell-shaped and flat-disc amplifier
Physics homework related to electric fields Physics homework related to electric fields
Simple Sentences by Marc (Grade 1) Simple Sentences by Marc (Grade 1)
Video: B cells and antibodies

For a complete list of videos, visit our video library