The Clue Source of power supply?
The Answer VOTE
The answer "VOTE" fits the clue "Source of power supply" because voting is a way for people to express their opinions and influence decisions. In a democracy, votes determine who gets elected and what policies are implemented, giving power to the people. Just like a power supply provides energy, voting provides the power to shape the government and society. Thus, a vote is a vital source of power in a democratic system.