In 30 seconds, an electric device delivering a current of 15.0 A allows approximately 2.81 x 10^21 electrons to pass through it. This is calculated by first finding the total charge and then converting that charge to the number of electrons. The charge of one electron is about 1.602 x 10^{-19} C.
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Maslow's hierarchy of needs can be applied in schools to ensure that basic physiological needs, safety, belonging, esteem, and self-actualization are fulfilled. Head teachers play a significant role in addressing these needs by creating a nurturing environment and implementing supportive policies. In Kenya, education system changes are necessary to improve quality and relevance but may encounter challenges like resistance from staff and resource shortages. ;