17.1. Electric Current http://www.ck12.org
http://demonstrations.wolfram.com/ElectricCurrent/
Illustrative Example 17.4.1
A total of 7. 9 × 1012 electrons move past a point in a conducting wire every 1.45 s. What is the average current in
the wire?
Answer:
The total charge moving past the point is the product of the electric charge of an electron and the number of electrons
moving past the point. The total charge is:→Q=
(
1. 6 × 10 −^19 electronC)
( 7. 9 × 1012 electrons) = 12. 6 × 10 −^7 →
13 × 10 −^7 C
The current isI=∆∆Qt =^12.^6 ×^10
− 7
- 45 s =^8.^69 ×^10
− (^7) A→ 0. 87 μA.