Electricity consumed by household appliances
BY, ALBI THOMAS VARKEY
ELECTRICAL ENGG-M.G UNIVERSITY MTech(TM)- UNIVERSITY OF KERALA 9995396795
Terminologies kW > Kilo WattskWh > Kilo Watts HourPL tube > Philips Lighting tubeCFL > Compact Fluorescent Lamp Cu.ft > Cubic FeetTR > Tons of Refrigeration HVAC > Heating, Ventilation and Air
ConditioningBTU > British Thermal Unit
TR
How to calculate consumption of electrical energy?
(Wattage × Hours Used Per Day) ÷ 1000 = Daily Kilowatt-hour (kWh)
1 kWh=1 UNIT
1 kilowatt (kW) = 1000 Watts
EXAMPLES (PER DAY USAGE) Question. How much units(kwh) of
energy is consumed by a bulb of 60 watts
per hour ?
=60 WATTS
Answer. For one hour if you are turning on the light, it consumes 60 watts, that means it consumes 60/1000=.06 units of energy and if it is kept ‘on’ for 12 hours likewise when we are in hurry to reach office or college the energy lost for 12 hours is (60*12)/1000=720/1000=.72units
Power consumed by CFL lamp of 20 watts working for 4 hours?
= 20 WATTS
Answer. 20 watts 4 hours=80/1000=.08 units
What is the difference between CFL and a colloquially called tube light/fluorescent
lamp?
• CFL bulbs have an electronic circuit in the base of the bulb. A miniature transformer that produces high voltage enough to ionize the gas in the tube.
• Tube lights are simply connected to the pins at the base. External ballasts must be used to supply the high voltage necessary to start the lamps.
How much units(kwh) of energy is consumedby a vaccum cleanerof
500 watts working 2 hours?
=500 WATTS
Answer. 500watts 2 hours=1000/1000= 1unit
Energy consumed by a ceiling fan working for 6 hours?
=100 WATTS
Answer . 100 watts ×6 hours =600/1000 = .6 unit
Energy consumed by a iron box working for 6 hours?
=1100 WATTS
Answer. 1100 watts ×6 hours=6600/1000= 6.6 units
HERE WE GO Personal Computer and Monitor
FOR MAKING THIS PRESENTATION,ie ALMOST 3 AND HALF HOURS...TILL NOW.
COMPUTER+ MONITOR =120 Watts + 150 Watts
=270 WATTS
Answer. 120watts+150watts=270 watts ×3.5 hours=945/1000 =.945 unit
Laptop working for 3 hours
= 50 WATTS
Answer. 50watts × 3hours=150/1000= .150 unit
Laser Printer working for 1 hour?
=375 WATTS
Answer. 375watts ×1hour=375/1000=.375 units
Refrigerator working for 2 ½ hours?
= 380 WATTS
Refrigerator = 16 cu. ft.
Answer. 380 watts 2 ½ hours=950/1000=.95unit
1 cubic feet=28.31 liters
Induction cooker of 3.6kw with a load max of 3.2 kw working for 45 minutes at various?
• 20 MIN consumes 600Watts• 10 MIN consumes 1500 Watts• 15 MIN consumes 3.2 kW=3200 Watts
Answer. 600 1/3=200/1000 =.2 units 1500 1/6=250/1000 =.25units 3200 1/4=800/1000 =.8units Total = .2+.25+.8 = 1.25 units
And our IDIOT BOX (TV) working for 3 hours watching a film?
=100 WATTS
Answer .100watts × 3hours=300/1000=.3 unit
Set top box working for 5 hours?
= 50 WATTS MAXIMUM
Answer. 50 watts 5hours=250/1000=.25unit
Satellite dish working for 4 hours?
= 50WATTS
Answer. 50watts 4 hours=200/1000=.2unit
Microwave Oven of rating 1660 W working for 45 minutes?
= 1660 WATTS
Answer . 1660watts 3/4 hours=1245/1000=1.245 units
Air conditioner rating of 1200 watts working for 2 ½ hours?
=1200 WATTS
Answer. 1200 watts 2 ½ hours=3000/1000 =3 units
Washing Machine working for ¾ hours
= 512 WATTS
Answer. 512watts ¾ hours= 384/1000 =.384 unit
Pump set of 1.5 hp power working 1 ½ hours?
1 hp=746 watts
1.5 746 = 1119 WATTS
Answer.1119watts 1 ½ hours=1678.5/1000=1.678 units
Cell Phone - recharging for 4 hours for an year?
= 4 WATTS
Answer.4watts 4hours 365days=5840/1000 =5.840units/year
DO YOU KNOW?
If you have plugged your mobile charger for 8 hours without switching ‘off ‘ what amount of electricity is wasted,
that is > (vampire power)
Answer . 6.5kWh ≥ 6.5 units/year 6.5/365 =.0175units per day
For more information
Log on to
• http://www.wholesalesolar.com/StartHere/HowtoSaveEnergy/PowerTable.html
• http://www.evsolar.com/power.html
Thank you