"The power that comes from a power plant, on the other hand, is called alternating current (AC). The direction of the current reverses, or alternates, 60 times per second (in the U.S.) or 50 times per second (in Europe, for example). The power that is available at a wall socket in the United States is 120-volt, 60-cycle AC power."
https://science.howstuffworks.com/electricity8.htm
"An alternating current has been proven to be more affordable when it comes to transmitting electricity over long distances. This is because an alternating current can be transmitted at a high voltage which means there can be a lower current and therefore less losses due to less resistance on the wires. Additionally, when using alternating current, you can use thinner wires which are cheaper to produce and cost less to suspend. An alternating current is also easier to change in terms of either raising or lowering the voltage through the use of a transformer. This allows electric businesses to raise the voltage in order to transmit it easily but also lower the voltage so that it can be used by a consumer. On the other hand it is harder to change the voltage of a direct current often due to a far more complex and expensive system. As a result of this a direct current can’t travel very far without losing much energy. It is therefore unpractical to use a direct current over long distances which is why an alternating current is used."
https://schoolworkhelper.net/direct-current-vs-alternating-current/
"The frequency of alternating current is 50 Hz or 60 Hz depending upon your country, most of them use 50 Hz, whereas frequency of Direct Current is 0 Hz."
https://durofy.com/alternating-current-vs-direct-current-a-brief-distinction
"Even low intensity 60 Hz fields are capable of causing DNA damage and weakening the immune system. Cancer cells exposed to 60 Hz electromagnetic fields for 24 hours show a sixfold increase in their growth rate.
The evidence is becoming overwhelming that cellular functions can be switched on and off through frequency specific electromagnetic radiation that induces nuclear magnetic resonance in the cell"
https://borderlandsciences.org/journal/vol/46/n03-4/Walonick_Effects_6-10hz_ELF_on_Brain_Waves.html
"Prolonged exposure to weak (~1 μT) extremely-low-frequency (ELF, 50/60 Hz) magnetic fields has been associated with an increased risk of childhood leukaemia."
https://elifesciences.org/articles/44179
"Living Next To Power Lines Increases The Risk Of Cancer
After hundreds of international studies, the evidence linking EMFs to cancers and other health problems is loud and clear. High Voltage power lines are the most obvious and dangerous culprits, but the same EMFs exist in gradually decreasing levels all along the grid, from substations to transformers to homes.
From the British Medical Journal, June, 2005:
Researchers found that children living within 650 feet of power lines had a 70% greater risk for leukemia than children living 2,000 feet away or more."
https://www.safespaceprotection.com/news-and-info/exposure-to-power-lines-linked-to-cancer/
Acute exposure to a 60 Hz magnetic field increases DNA strand breaks in rat brain cells
https://onlinelibrary.wiley.com/doi/abs/10.1002/%28SICI%291521-186X%281997%2918%3A2%3C156%3A%3AAID-BEM8%3E3.0.CO%3B2-1