Doorbells operate on very low voltage. Older models typically require just 8 to 20 volts of electricity -- most often 16 volts -- while newer models take 24 volts of electricity. Newer models have higher voltage output to accommodate longer runs of wire in larger homes.
Individuals who aim at becoming management researchers or professors may complete the Doctor of Business Administration (DBA) or the PhD in business administration or management. There are three levels of managers, which are typically organized in a hierarchical, pyramid structure.
ADVERTISEMENTS: Management: Management as a science, arts and profession! Some authors regard management as science because there are well tested and experimented principles of management, some authors describe management as an art because more practice is required in management and some authors consider that management is going towards the paths of profession.