A 30A current caused by moving electrons flows through a wir

A 3.0-A current caused by moving electrons flows through a wire.

Part A: Determine the number of electrons that flow past a cross section each second. The answer is 1.9 x 10^19.

Part B: The same number of water molecules moves along a stream. Determine the volume of water that moves each second under a bridge that passes over the stream.

Solution

a)Current is charge that passes per second>

Therefore: I=ne which gives: n = I/e = 3/1.6*10^-19 = 1.875*10^19

b) PV = nRT

Assuming, P = 1atm, T = 300K, n = number of moles = 1.875*10^19/6.022*10^23 = .311*10^-4 moles.

R = .082 L-atm/K/mol

V = nRT/P = .0000311*.082*300/1 = .000766 litres