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GENERAL ENGINEERING-ELECTRICAL ENGINEERING NOTES

Current is the flow of electric charge in a circuit or a conductor. It is measured in amperes (A), which is defined as the amount of charge that passes through a cross-section of a conductor in one second. One ampere is equal to one coulomb per second. Current can be direct (DC) or alternating (AC), depending on whether the direction of the charge flow is constant or changing periodically. The symbol for current is I .

Voltage is the difference in electric potential between two points in a circuit or a conductor. It is measured in volts (V), which is defined as the amount of energy required to move one coulomb of charge from one point to another. One volt is equal to one joule per coulomb. Voltage can also be thought of as the force that pushes or pulls the charge in a circuit. The symbol for voltage is V .

Power is the rate at which energy is transferred or transformed in a circuit or a device. It is measured in watts (W), which is defined as the amount of energy transferred or transformed per unit time. One watt is equal to one joule per second. Power can also be calculated as the product of voltage and current, P = VI, which shows how much energy is delivered or consumed by a circuit or a device. The symbol for power is P .

Energy is the capacity to do work or transfer heat. It is measured in joules (J), which is defined as the amount of work done or heat transferred when a force of one newton moves an object by one meter. One joule is equal to one watt-second. Energy can be stored in various forms, such as chemical, mechanical, thermal, electrical, nuclear, etc., and can be converted from one form to another by various processes, such as combustion, friction, induction, etc. The symbol for energy is E .

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