Description: Citizens vote for their government officials and these officials represent the concerns and ideas of the citizens in government.
Example: For example, your Governor is elected by the voters in your state.
Description: The Constitution grants powers to Congress and any disputes are decided by the Supreme Court.
Example: The executive power is vested in the President, although power is often delegated to the Cabinet members and other officials.
Description: Power in a government can be distributed into three forms: unitary, confederation, and federal.
Example: In a unitary, all power is in the hands of the central government
Description: Legislative - Makes laws
Executive - Carries out laws
Judicial - Evaluates laws
Hope this helps :)