What is the frequency of 220mathrm - - mathrm - DC - voltage- 0 HZ50mathrm - Hz -60mathrm - Hz -220mathrm - Hz -

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What is the frequency of 220 $v D C$ voltage?
0 HZ
50 $H z$
60 $H z$
220 $H z$

0 HZ

H z

H z

220

H z

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