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4 answers

This really depends on the mains voltage that the device is designed for, and its power rating.

The story can get very complicated for equipment containing electronics or electric motors, but in rough terms, the resistance R of something like a heater is given by

R = V^2/P where V is the supply voltage and P is the rated power for the appliance as shown on the plate.

There is another complication in that the resistance of a metal heating element or light filament is lower when it is cold than it is when it has heated up to its working temperature. Just measuring its resistance using an ohm-meter is likely to give a misleading result.

2007-01-29 23:38:40 · answer #1 · answered by lunchtime_browser 7 · 0 0

In the UK, power consumption of home appliances commonly runs from 40 watts (bedside lamp) to 3000 watts (electric kettle). At 250 volts, I make that roughly 1600 ohms for the lamp, and 20 ohms for the kettle.

Less commonly, a 15 watt night light would be 4000 ohms, and a 10 kilowatt electric shower would be only 6 ohms.

2007-01-30 15:29:02 · answer #2 · answered by bh8153 7 · 0 0

If you mean power consumption, they go from night lights (15 watts) or less than .1 amps for 110 volts to about 2000 watts (10 amps at 220 v) for stoves and electric dryers.

2007-01-30 07:14:31 · answer #3 · answered by Gene 7 · 0 0

first of all you have to pay attention that they are mostly inductive-resistance loads.most of them are universal machines which you have to calculate their power and effiecieny then calculate their power factor and you can calculate their resistance and inductance.about lights the power is written on them v^2/power is their resistance

2007-01-30 07:04:28 · answer #4 · answered by nima_iran_1985 3 · 0 0

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