9–26 Consider a 15-cm X 20-cm printed circuit board (PCB) that has electronic components on one side. The board is placed in a room at 20°C. The heat loss from the back sur- face of the board is negligible. If the circuit board is dissipat- ing 8 W of power in steady operation, determine the average temperature of the hot surface of the board, assuming the board is (a) vertical, (b) horizontal with hot surface facing up, and (c) horizontal with hot surface facing down. Take the emissivity of the surface of the board to be 0.8 and assume the surrounding surfaces to be at the same temperature as the air in the room. Answers: (a) 46.6°C, (b) 42.6°C, (c) 50.7°C

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Employment Opportunities

A monetary relationship, where one individual performs a set of services for another individual or organization under a mutual agreement and gets remunerated for providing such service, is said to be an employee. The individual who provides the services is known as an employee and the individual who pays for the service is known as an employer. In simple terms, the employee is said to have a job.