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A polarity test typically determines the direction of current flow from a DC power source.

(Battery, DC power brick, etc.) If the polarity the a power source is reversed, odds are the circuit will not function as designed.

And because more radiation would reach Earth’s surface under very low field strengths during a global reversal, it also might affect rates of cancer.

We still don’t fully understand what the extent of these effects would be, adding urgency to our investigation.

The magnetic field strength is so weak there that it’s a hazard for satellites that orbit above the region – the field no longer protects them from radiation which interferes with satellite electronics.

And the field is continuing to grow weaker, potentially portending even more dramatic events, including a global reversal of the magnetic poles.

The spectacle of the northern lights might appear at different latitudes.(60 hertz in the US) To change the polarity of current, simply reverse its direction, positive for negative and negative for positive.Of course, if you have any direction sensitive components, such as diodes, in the circuit, this will not work.Welder polarity has to do with DC (Direct Current) welders.Essentially, polarity is the direction of the current.

When the machine is set for straight polarity, the current…