WHAT IS THE DIFFERENCE: AC vs DC?
- Appliances that operate either with batteries or by plugging into the household wiring usually come equipped with an AC/DC switch.
- If switched to AC, the appliance uses electric power that flows back and forth or "alternates" at a (U.S.) rate of 60 cycles per second (60 hertz, or Hz).
- If DC ("direct current") is chosen, current flows one way from the batteries to the appliance.
- AC fields induce weak electric currents in conducting objects, including humans
- DC fields do not, unless the DC field changes in space or time relative to the person in the field.
- In most practical situations, a battery-operated appliance is unlikely to induce electric current in the person using the appliance.
- Induced currents from AC fields have been a focus for research on how EMFs could affect human health.
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