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Transcript
Earth’s Changing Environment Lecture 16 On and Off the Electric Grid Electric Power Grid On the Grid - AC Power Electric Power Plants produce AC – Alternating Current. Batteries produce DC – Direct Current Transmission Transformers step up the generator voltage from 1 kV range to 100 kV range Why? Power Substation Transformers step down to kV range for neighborhood distribution House Power Transformers on power poles drop the voltage down to 240 VAC for home use. Watt-Hour Meter Watt-hour meter measures and records energy use. Most house appliances use AC. Some household devices use 240 v and some use 120 v. Off the Grid - Distributed Power DC Some distributed or off-grid systems use generators that produce DC power. High voltages AC is not needed because of short transmission distance Inverters can generate AC for AC loads. Storage or Back-up Off-Grid Power Systems need back-up or storage. Back-up can be gasolinepowered generators or other forms of energy. Storage can be battery, thermal, or mechanical Battery Storage Batteries are usually 6.0 volt or 12 volt DC. Battery storage capacity expressed in Amp-Hour values. A 100 Amp-Hour battery could deliver 5 Amps for 20 hours.
