It takes 30 seconds for the 480 W toaster to toast a piece of bread. How many electrons were used?
2007-01-21 17:21:21 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Depends on your local voltage.
W = Pt = 480 (30) = 1440 J.
On a standard (.au) voltage of 240V we have
W = Vq => q = 1440 / 240 = 6 C.
So the number of electrons = 6 / (1.602 * 10^-19) = 3.7 * 10^19 electrons.
At the standard American voltage of 110V this would be 8.2 * 10^19 electrons instead.
2007-01-21 17:29:25 · answer #1 · answered by Scarlet Manuka 7 · 0⤊ 0⤋
There is a missing datum: the voltage. Assume that it is 120 volts. Then, the current flow is 4 amperes, which for 30 seconds would be 120 coulombs. The charge on one electron is 1.6E-19 coulombs, so divide this into 120 to get the answer.
2007-01-22 01:27:52 · answer #2 · answered by Anonymous · 0⤊ 0⤋