tɹænsfˈoːɹmɚz duːnˌɑːt tʃˈeɪndʒ ðə fɹˈiːkwənsi ʌv ᵻlɛktɹˈɪsᵻɾi; ɪn mˈɛni ɹˈiːdʒənz wɪð wˈʌnhˈʌndɹɪd wˈʌnhˈʌndɹɪd twˈɛnti vˈiː, ᵻlɛktɹˈɪsᵻɾi ɪz səplˈaɪd æt sˈɪksti ˌeɪtʃzˈiː, ænd tˈuːhˈʌndɹɪd tˈɛn tˈuːhˈʌndɹɪd fˈoːɹɾi vˈiː ɹˈiːdʒənz tˈɛnd tə jˈuːz fˈɪfti ˌeɪtʃzˈiː.
Transformers do not change the frequency of electricity; in many regions with 100–120 V, electricity is supplied at 60 Hz, and 210–240 V regions tend to use 50 Hz.