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This lecture covers the concepts of electrical power and resistance in direct current circuits. It explains the definition of electrical power, its unit (Watts), and the work done by electric force on a charge. The lecture also introduces the concept of resistance in a conductor, discussing how electrons are slowed down due to collisions. The Ohm's Law is presented, showing the proportionality between current and voltage in a conductor. The model of resistance in a conductor is detailed, emphasizing that lower resistance allows electrons to move more easily, resulting in higher current flow for a given voltage.
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