Assertion: direct current's frequency | /r/ObjectUse | used for domestic and commercial power
Facets:
Source sentences:
text: Low frequencies, such as 50 and 60 cycles per second (hertz), are used for domestic and commercial power, but alternating currents of frequencies around 100,000,000 cycles per second (100 megahertz) are used in television and those of several thousand megahertz in radar or microwave communication.