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Everyday microwave oven physics: Does the energy transferred depend on what is inside?
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[QUOTE="tech99, post: 6826195, member: 477979"] If we consider the magnetron as a generator and the coffee cup as its load, then for max power transfer the resistance of the two will be equal. If we now reduce the load resistance to half by adding a second cup of coffee, the total power transferred will drop only slightly. This may be seen if the generator resistance is considered to form a potentiometer with the load resistance. For one cup, Rg=Rl and voltage is one half, but for two cups the voltage is 0.5 Rl/(0.5 Rl + Rg) = 0.5 / (0.5 + 1) = 1/3. The power delivered to one cup is then V^2/R = 1/(4 Rl) and to two cups is 2/(9 Rl). so the comparison is 0.25 in the first case and 0.22 in the second. From this I would conclude that two cups will take approximately twice as long as one. In other words, the total energy being supplied is not excessively sensitive to the actual load. [/QUOTE]
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Everyday microwave oven physics: Does the energy transferred depend on what is inside?
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