The state electrical board must consist of five members appointed by the governor for a term of five years with their terms of office so arranged that one term and only one term expires on June thirtieth of each year. One member of the board shall represent the public and may not be directly associated with the electrical industry. The board must include a master electrician who is a contractor, a journeyman electrician, a consumer member of a rural electric cooperative, and a person associated with an investor-owned utility. A member of the board shall qualify by taking the oath of office required of civil officers and shall hold office until that member’s successor is appointed and qualified. The governor shall fill any vacancy by appointment for the unexpired term of office.