Likewise, the MPPT varies the ratio between the voltage and current delivered to the battery, in order to deliver maximum power. If there is excess voltage available from the PV, then it converts that to additional current to the battery. Furthermore, it is like an automatic transmission.
On the Supreme Court of the United States, Associate Justices Potter Stewart and Anthony Kennedy have been described as swing votes between the two factions of the court. In the United Kingdom, the  Essex man ,  Worcester woman  and  Holby City woman  are examples of personifications of swing voters.
The well-publicized nomination of Bork to the Supreme Court by President Reagan in 1987 saw Bork get just 42 votes in the Senate, when the Republicans had just 45 seats. Not surprisingly, in every instance since 1945 when the same party controlled the White House and the Senate, that nominee was approved.