EES 0837 Lecture Notes - Lecture 24: Electricity Meter, Kilowatt Hour
3 Apr 2016
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Lecture - 24: energy footprint, a case study, electricity meter, electricity meters read in kwh (kilowatt-hour) This is a unit of energy: power times time. 1 kwh is 1,000 w over 1 hr = 3,600 seconds: or 1 w over 1000 hours, or 100 w over 10 hours. Thus 1 kwh = 3,600,000 j (= 860 kcal: my electricity bill indicates a cost of sh. 13 per kwh. Try getting 860 kcal of food for sh. 13. Tastes bad, though: burnt tongue smell/taste: measuring your electricity consumption, all houses/apartments have energy meters to monitor electricity usage. This is what the bill is based on: dials accumulate kwh of usage, disk turns at rate proportional to power consumption. So looking at next dial helps you figure out rounding. Note second dial halfway between 0 and 1: next digit ~5. 22199: measuring the wheel rate, recall that the kh constant is watt-hours per turn of the disk.
