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Old 19th February 2012, 12:30 AM   #1
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Default 8 ohm test speaker load

Hello all,
I wand to test some 100 wat amps which are 8 ohm speaker outputs but don't have a dummy load. I measured my electric kettle which is 7.8 ohms and rated 1500 watts. I suppose it's a straight resistance load, with hardly any inductance to speak of. Is that resistance value close enough and acceptable to use as a load for testing power output.
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Old 19th February 2012, 12:47 AM   #2
Pano is offline Pano  United States
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Yes Dennis, it will work. Just don't forget to put water in it!

I have used the little oil filled radiators (space heaters) as large dummy loads. Pretty much the same thing.
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Old 19th February 2012, 12:54 AM   #3
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Its ok for testing power however the lack of an inductive load might not show up possible oscillation problems in the amp.
Murton-Pike Systems PCBCAD51 pcb design software. http://www.murtonpikesystems.co.uk
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Old 19th February 2012, 07:37 PM   #4
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thanks guys, I won't forget to put water in the kettle
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Old 19th February 2012, 07:48 PM   #5
sreten is offline sreten  United Kingdom
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Same with electric bar fires :

Click the image to open in full size.

They make an excellent dual purpose dummy load / space heater.

rgds, sreten.
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