Cost

• NEVER CONVERT 'k' IN THIS TOPIC (e.g. 17kw stays kw)
• there are two ways to find out cost of elec -= reading meter (A) or equations (B)
• I have used 200 units, and the price per unit is 12p; the cost = £240
• 1 unit of elec = 1kwh
• 1kw = 1000 W
• To change Watts into kW divide by 1000
• 9000W = 9kW
• 10,000 Watts=10 Kilowatts
• 10W = 0.01 Kilowatts
• When using these equations, all times have to be in hours!
• To change mins into hrs, divide by 60 (60 mins in 1 hour)
• Hours into mins = x 60
• 60 mins = 1 hour
• 30 mins = 0.5 hours
• 20 mins =0.3 hours
• 120 mins = 2 hours
• Seconds into hours = divide by 3600 (3600s in 1 hour)
• 10,800 seconds = 3 hours
• 8000 seconds = 2.2 hours
• 300 seconds = 0.083 hours
• Energy efficiency rating = effectivness increases upwards but so does the cost
• Energy efficiency rating =the higher up the more effective = less electricity wasted = cheaper (in long run) + more sustainable