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Mini-Quiz: List of Worldwide AC Voltages and Frequencies

by Ron Kurtus (updated 30 May 2023)

Take this Mini-Quiz to check your understanding of the lesson material.

1. Out of 200 countries, which voltages are used the most?

100-120 V

220-240 V

250 V

2. Which frequency is used the most of the 200 listed countries?

50 Hz

60 Hz

220 Hz

3. Do any countries use both 120V and 240V?

No, it is impossible to use both voltages in a single country

Only the United States uses these two voltages

Several use both voltages

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

Electrify society by applying your knowledge of science

Resources and references

Ron Kurtus' Credentials


Plug, socket & voltage by country -

Mains electricity by country - Wikipedia

Utility frequency - Wikipedia

Guide to International Travel With Electric Appliances - Good information from Lewis N. Clark

DC and AC Electricity Resources

Physics Resources


(Notice: The School for Champions may earn commissions from book purchases)

Basic Electricity by Bureau of Naval Personnel; Dover Pubns; (1970) $14.95 - Provides thorough coverage of the basic theory of electricity and its applications

Teach Yourself Electricity and Electronics by Stan Gibilisco; McGraw-Hill; (2001) $34.95 - Guide for professionals, hobbyists and technicians desiring to learn AC and DC circuits

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