China was the last to join the Allied Powers, officially recognized after the U.S. entered World War II. Prior to that, China had been fighting against Japan since 1937. Thus, it solidified its place in the alliance against the Axis powers. ;
In a device delivering a current of 15.0 A for 30 seconds, approximately 2.81 billion billion electrons flow through it. This was calculated by finding the total charge using the formula Q = I × t and then determining the number of electrons using the charge of a single electron. Therefore, around 2.81 × 10^21 electrons pass through the device.
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