Whenever two same object pass at a same time, object counter consider only one object and count only one.
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Advantage:1:To overcome half subtractor, full subtractor comes into play
Johnson counter is a ring counter, which is a type of counter composed of a circular shift register. Johnson counter provides many shift registers and ring counters.
There are no energy sources without disadvantages.
The 555 is a timer, not a counter.
disandvantage:-the wheatstone bridge is not applicable for high resistances advantage:-1)it shows a null measurement(i.e.-potential difference across the end points of the bridge is zero) 2)since it is an arrangement of 4 resistors ...it is useful to find one of them in terms of other 3