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Haha Neil. You make me laugh.I'd have to say that microwaves don't really lose all their power, but the might lose some of its cooking ablity. My grandpa has had a microwave for years and years and I think his works just fine, but he doesn't use it a million times a day like we use ours. Our microwave completely breaks down and beyond all hope of fixing it every 2 years. Ha.
A magnetron will lose output over time but I would think it would have to run for thousands of hours before it becomes noticeable but it is possible that the frequent on-off use may shorten its life considerable. 'Valves' (vacuum tubes), which includes klystrons, magnetrons. CRTs, Travelling Wave Tubes (used a lot in satellites) have finite lives mainly because the cathodes lose emission.
Power output (roughly..not an exact test) = temperature rise x 35.
Quote from: Pumblechook on 07/07/2008 14:14:25Power output (roughly..not an exact test) = temperature rise x 35. Cool where did u get the formula from?
mine microwave oven used to heat a cup of water(2 minutes) to the extent that when i added instant coffee granules the water in the cup would boil, suffusing my kitchen with a mouth watering aroma!now sadly i heat my cup of water for 5 minutes and it no longer boils when granules are added.
I have just tested our 800 Watts oven using a heating test and I get about 600 Watts. We have had it quite a few years. It seems to be using about 1100 Watts from the mains. It should be 1400 W. The power test is heating 500 mL of water for 60 secs.Power output (roughly..not an exact test) = temperature rise x 35. I get a 17 deg C rise 35 x 17 = 595 Watts. We hadn't noticed a fall-off.