Power Consumption Tables

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Related Page:

Calculating Power Usage

    

The methods involved in deriving the information on these tables is set out on the Calculating Power Usage page.

In the tables I've tried to use the most appropriate means for calculating the power consumed by each appliance. In some cases, 2 or 3 examples are given to show the slight differences obtained by using the various methods.

Kitchen Appliances

Appliance

Load
Type

Comments

Power Consumption figures
Abbreviations:  
  PM - Power Meter Pi - Instantaneous Power
  EM - Electricity Meter Pt - Power consumed over time
Microwave Oven
(1000 W output)		 Const. On High Power

Labelled:
1500 W

Pt calculated from label:

25 Wh per minute
(250 Wh per 10 min)

Measured by PM:
1660 W

Pt estimated from PM Pi:

26 Wh per minute
(264 Wh per 10 min)
Stove Element Const. Medium sized element.
Some other stoves have elements controlled by thermostat.

Pi & Pt estimated from current measured.

Setting:

    

Lowest

Pi = 150 W

Pt = 25 Wh per 10 min

Highest

Pi = 1500 W

Pt = 250 Wh per 10 min
Oven (Electric) Var. Oven set for 180°C
* = warm-up time

Pi calculated from
Oven warm-up time:
2400 Watts

Pt read from house EM:
After 20 min* 800 Wh
After 60 min 1000 Wh
After 90 min 1500 Wh
Griller Const. Full/High Setting

Pi & Pt estimated from current measured:

2200 W

730 Wh for 20 min
(365 Wh per 10 min)
Sandwich Toaster Var. 2 Sandwich model

Labelled:
900 Watts

Pt measured by PM:
Warm Up 54 Wh
2 Sandwiches 80 Wh
Toaster Const. Toast 2 slices of bread. Time taken : 155 sec

Labelled:
1000 W

Pt measured by PM: 43 Wh
Pt calculated from label: 43 Wh
Jug Const. Boil 1 litre of water. Water started at 22°C. Time taken: 158 sec

Labelled:
2400 W @ 240 V

Pt calculated from label:
105 Wh assuming 2400 W as labelled.

Pi measured by PM:
2250 W @ 236 V

Pt measured by PM: 99 Wh
 

Pt by water heating formula: 91 Wh assuming 100% effeciency. Allowing for 10% ineffiency : 100 W

 

Other Appliances

Appliance Load
Type

Comments

Power Consumption figures
Abbreviations:  
  PM - Power Meter Pi - Instantaneous Power
  EM - Electricity Meter Pt - Power consumed over time
TV - 34cm colour Const. * Av power. Changed from 43 W to 53 depending on screen content.
Labelled:
55 W
Pt calculated from label:

55 Wh per hour
(9.2 Wh per 10 min)
Pi measured on PM:
48 W *
Pt estimated from PM Pi:

48 Wh per hour
(8 Wh per 10 min)
TV -76cm colour Const.  
Labelled:
150 W
Pt calculated from label:

150 Wh per hour
(25 Wh per 10 min)
Iron Var. Dry Iron
* = warm-up time
Labelled:
1000 Watts

Pt Measured by PM:
After 2 min *

34 Wh
After 10 min 55 Wh
After 15 min 67 Wh
After 20 min 88 Wh
After 25 min 105 Wh

 

Lights - See Lighting page for more info.

Appliance Load
Type

Comments

Power Consumption figures
Abbreviations:  
  PM - Power Meter Pi - Instantaneous Power
  EM - Electricity Meter Pt - Power consumed over time
Incandescent Lights Const.  
 

Pt calculated from label:

Labelled:

per hour consumption

per 10 min consumption

60 W

60 Wh

10 Wh

100 W

100 Wh

16.7 Wh
CFLs (Compact Fluorescent Lights) Const. To obtain the equivalent light output of a CFL compared to an incandescent globe, divide the wattage by 4 or 5. eg 20 W CFL puts out a similar amount of light to a 100 W incandescent globe.
 

Pt calculated from label:

Labelled:

per hour consumption

per 10 min consumption

15 W

15 Wh

2.5 Wh

20 W

20 Wh

3.3Wh
Fluorescent Lights   Tubes are rated 15 or 18 W respectively; Ballast also consumes around 10 W.
15 W unit is a desk lamp.
   

Pt calculated from Pi:

Labelled:

Pi measured on PM:

per hour consumption

per 10 min consumption

15 W

26 W

26 Wh

4.3 Wh

18 W

28 W

28 Wh

4.5 Wh

Last updated: May 23, 2004.