ELECTRICITY AND MAGNETISM - ELECTROMAGNETIC RADIATION - TRANSMISSION LINES AND ANTENNAS NC State University Faculty Access

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Transmission Lines
# 5N10.15


Description: One light bulb is connected directly to a coil with 100 ft of telephone wire; it glows brightly. Another light bulb is connected to a transformer where the voltage is stepped down from 110 V to 24 V, so the current increases. The current runs through the 100 ft of wire, where the greater current causes energy losses. The current then goes through another transformer, where the voltage is stepped up again and the current decreases, so the light bulb glows dimmer than the first. This shows how power companies should step their voltage up to decrease the current through the wires and decrease energy loss.

Purchased/Built: built

Setup Time: None

Quant. in Demo Room: 1

Demo References
Sutton E-244 A model transmission line with a lamp for a load that shows a loss unless transformers are used to boost voltage up and back.

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