Electric power is transformed to other forms of energy when electric charges move through an electric potential difference, which occurs in electrical components in electric circuits. From the standpoint of electric power, components in an electric circuit can be divided into two categories: Passive devices or loads: When electric charges move through a potential difference from a higher to a lower voltage, that is when conventional current (positive charge) moves from the positive (+) terminal to the negative (â) terminal, work is done by the charges on the device.
For works created by individual authors on or after January 1, 1978, copyright protection begins at the moment of creation and lasts for a period of 70 years after the author's death. In the case of a joint work (prepared by two or more authors) the term lasts for 70 years after the last surviving author's death. For works made for hire, and for anonymous and pseudonymous works, copyright protection generally lasts for 95 years from publication or 120 years from creation, whichever is shorter.
Expiration of Copyrights. Copyrights do not last forever. The life of a copyright for creative material produced or published after 1977 is the life of the author plus 70 years. In other words, the copyright lasts for as long as the author remains alive and for an additional 70 years after the author dies.