What is the definition of transmission lines in electrical systems?

• A. The unit of electrical resistance
• B. An instrument to measure voltage
• C. Any conductor or system of conductors used to carry electrical energy from its source to a load
• D. A device to store electrical energy

Answer: (C)

Transmission lines are the path for electrical energy, defined as any conductor or system of conductors used to carry electrical energy from its source to a load. They can be overhead wires, underground cables, or similar arrangements that connect power sources or substations to where the energy is used. The key idea is moving power from generation to consumption while keeping the voltage and current at appropriate levels, which involves the line’s distributed properties like resistance, inductance, and capacitance. They’re designed for energy transfer, not for measuring voltage or storing energy. That’s why this concept differs from a unit of resistance (ohm), a device used to measure voltage (voltmeter), or a device that stores energy (battery or capacitor).