What doesn't move, however, is a suspended mass inside the seismograph, called the seismometer. During an earthquake, the seismometer remains still while the case around it moves with the ground shaking. Traditionally, the suspended mass was a pendulum, but most modern seismometers work electromagnetically.
Solar electricity costs about $10 to $12 a watt installed, though you may be eligible for state incentives. Check your utility bill to see your monthly usage. A robust solar electric system will cost about $20,000. You can spend as much money, to receive as much solar electricity, as you feel comfortable with.
pricing for solar photovoltaic pv systems generally solar pv systems that generate electricity from sunlight cost between $ 1 95 to $ 6 per installed watt typically the larger the system the lower price per watt large commercial systems are typically well below $ 3 per watt residential systems because of their smaller size are usually somewhat higher