An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
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In a device delivering a current of 15.0 A for 30 seconds, the total charge is 450 C. Using the charge of an electron (approximately 1.6 x 10^{-19} C), we find that about 2.81 x 10^{21} electrons flow through the device during this time. Thus, around 2.81 billion billion electrons are involved in the current flow.
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