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

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Thank you