Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions


Typically the frequency of the AC electrical current feeding the bell. This can be 50CPS or 60CPS depending on the country. Sometimes bell manufacturers put a diode in series with the bell circuit that lops off half the current cycle creating either a 25cps or 30cps bell ringing frequency. Old electromechanical central offices used to ring the bell on party line phones with different frequencies. Each subscriber had a capacitor tuned to the bell coil that was "excited" at a different natural frequency allowing up to 4 people to share a single phone line and be individually notified of a call for them. The frequencies they used were 20, 30,40, 60 cps.

The frequency at which the current changes direction is the frequency of the sound that the speaker produces.

0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts