Explain how rotary dialing sends digits to the switch.

A rotary dial telephone was a popular type of phone design throughout the 20th century. ... This causes the dial to return to its starting position due to an internal recoil spring, while simultaneously generating a series of electrical pulses that interrupt the flow of current on the telephone's line.

Answer by checking for voltage with a neon tester;

What are the choices? then ill be able to . on normal circumstances id say try a catchier title and topic