2. kWh Amount of kilowatts used times the amount of time used in hours. Example: 500 watts used for 30 minutes =.5kW x.5 hours =.25 kWh

3. Hair dryer uses 1400 watts. Takes 1 hour a day for every day of the year. The cost is $0.10 for every kWh used. What is the cost per year? 1400W * 1 hr * 1 kW * 365days * $0.10 day * 1000W* 1 yr * kWh

4. Mom wants you to spend 1 hour every day using a 1500 W vacuum. You want to spend 1 hour every month. At $0.10 per kWh, how much could you save? MOMS 1500W* 1 hr * 1 kW * 365 days * $0.10 day* 1000W * 1 yr * kWh YOURS 1500W * 1hr * 1kW * 12mo. * $0.10 mo *1000W* 1yr * kWh Find difference.

5. You use 10,000 kWh every year until you buy a solar water heater that saves you 20% of your total consumption. How much $ do you save in 5 years at the rate of $0.10 per kWh $1,000 savings in 5 years

6. A town uses 800,000 kWh every year. A methane capturing landfill can produce 10 kWh every day for each acre. How many whole acres is needed to supply the town? Answer = 220 acres