Summary
Highlights
This lesson focuses on electricity generation, transmission, and distribution. Electricity is essential in modern life, powering industries, homes, and various appliances. It's an integral part of daily life since its discovery.
Electricity is generated at power plants from various sources. Examples include geothermal power plants, which use heat from the earth to drive turbines. Other sources include running water, wind, solar heat, nuclear reactions, and fossil fuels. The Philippines explores non-conventional energy resources for sustainability.
Electricity generation largely relies on magnetism. Large turbines powered by energy sources are connected to a generator, which converts mechanical energy to electrical energy. This is possible through electromagnetic induction, a phenomenon discovered by Michael Faraday, involving the interaction between a changing magnetic field and a conductor.
After generation, electricity flows through large wires to a step-up transformer, which increases its voltage (up to 756 kilovolts) for long-distance transmission. It then travels through power lines to substations, where a step-down transformer lowers the voltage (13-2 kilovolts). Further voltage reduction (240-120 volts) occurs at pole transformers or transformer boxes before reaching homes through service boxes with electric meters.
Electricity consumption is calculated based on the electrical power consumed and the duration of usage. The formula is Energy (E) = Power (P) × Time (T), where energy is in kilowatt-hours, power in watts (converted to kilowatts), and time in hours. A sample problem demonstrates how to calculate energy consumption and its cost based on a given rate per kilowatt-hour.
Key concepts include: A power plant generates electricity, a generator converts mechanical to electrical energy, transmission lines carry high-voltage electricity over long distances, and distribution lines deliver lower-voltage electricity to consumers. Essential equipment includes turbines, generators, and transformers. Power loss occurs during transmission due to wire resistance.