sequential (34) voltage
https://kamchihau.blogspot.com/2022/11/httpskamchihau.htm
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Ref: https://wodewangzhishime.blogspot.com/2022/10/httpswodewangzhishime.html
.Me: Circuit B of the upper picture isn't loaded. Therefore, resistance of circuit A is high. John:But, circuit B of the lower picture is loaded with a rectifier diodes. . Consequently, the resistance of circuit A is low.
if (circuit B = load)
{
resistance of circuit A = low;
}
else if (circuit B = unload)
{
resistance of circuit A = high;
}