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A microwave oven uses 1200 W of power The voltage source is 120 V What is the current flowing through the microwave?
Chezzyg
10 The typical formula for this is. P = VI. I = P/V = 1200 /120 =10 A Hence, one would think that the answer is 10 A.
However, this formula applies only for DC current. For AC current,
P=VI cos (theta) where theta is the phase difference between V and I. This phase difference is created by the inductances inside the microwave oven. This phase difference is probably mentioned on the specifications of the microwave.
Otherwise another specification maybe mentioned called "MVA". Power (measured in MVA) = V * I Using this , we can directly measure the I.
However, in the absence of either of the two additional information, it is impossible to fully find I.
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10
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