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First, some fun:
Here's what we have learned so far:
Campus walk around:
- PV installations: PPA array, elab, commons (not the trees), IT building complex (IT, art, CLH, english)
- Solar thermal installations (elab), Perry-Fiske, Carter, Cafeteria
- Modes of solar thermal (passive Solahart and active)
- Return on investment (ROI) and total cost of ownership (TCO)
VOM party:
- Volts is capitalized since it is named after a person (usually dead)
- Vdc means direct current (V= on the meter)
- Vac means alternating current (V~ on the meter)
- CPR/defibrillators can kill nurses if they don't yell "clear!" and why
- Ohm is a dead German dude
- Ω can be spelled with option-z on your computer (new one!)
- Ohms is a measure of resistance to DC current
- Kumbaya is a fun song
- Very small currents can be measured by the VOMs (Volt ohm milliammeter, the pretty yellow things)
- Ohm's law says V-iR, where V is volts (not bolts, they run very fast), I is current in Amperes and R is resistance in ohms (not the meditation kind)
- Joule's law (never told you the name, so here it is) says that P = Vi where Power is in Watts (yes, another dead dude), i is in Amperes (yet another dead dude) and V is in Volts (last dead dude in this formula)
- Another version of this is P = I2R, which we will cover later. Physics people can also show off with P = V2/R
Hot water and killing Watts:
- We measured power, which is the rate of using energy, measured in Watts
- 1000 Watts is one kiloWatt (kW)
- 1500 Watts would therefore be 1.5 kW
- We checked to see if our meters worked well, they did: Power = Voltage x Current
- 1 kW running for 1 hour is 1 kWh or kiloWatt-hour. It is a measure of energy used
- Think of bucket analogy: you pay for the water (kWh), not how fast it comes out (kW)
- 1 kWh here at HPA costs about $0.45 which we round to $0.50 or fifty cents.
- Next: power factor fun, measuring other things, and watching elabTV (elab2.hpa.edu)
Friday (today):
- quiz on what you see above first
- wind fun (see link above)
- review of power and energy (kW and kWh)
- using elab2.hpa.edu to measure power used or produced
- using elab4.hpa.edu to do this on the entire campus (insert evil laughter here)
~Energy
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