Electrons through wire work physics problem

AI Thread Summary
Electrons are moving through a wire at a rate of 5 x 10^19 electrons per second, with an electric potential difference of -3 volts between two ends of a device. The discussion centers on calculating the rate of work done on the device, which is related to power. The relevant equation for power is identified as the product of voltage and current (P = V * I). Current can be expressed as the charge flow per unit time, using the number of electrons and their charge. The solution requires applying these equations to find the work done on the device.
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Homework Statement


Electrons move in a wire in the direction shown through an electrical device at the rate of 5*10^19 electrons per s. If the two ends of the device are at different electric potentials, V(a)-V(b)=-3 Volts, and if the electrons emerge at the same speed with which they entered, then the rate at which work is being done on the device is?

https://elearn.wmich.edu/webct/urw/lc571145591061.tp572778900061/RelativeResourceManager?contentID=572779805061


Homework Equations



?

The Attempt at a Solution


I'm just not sure what the equation for work would be here, even though I probably already know it and can't remember but I didn't see it in my physics book either.
 
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Rate of doing work = power = V*I
Current = dQ/dt = n*e/dt.
N is given, e is known and dt = 1 s. Find W.
 
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