2 marksDefine the amp.
2 marksA charge of 60 × 10–6 C flows through a given section of a conductor in 140 × 10–3 s. Calculate the electric current, stating the final answer in mA.
4 marksUse words from the list below to complete the description of the movement of charge carriers in a conductor.
| average current | delocalised | electric force |
| electric field | randomly | drift |
The charge carriers in a metal conductor are ...................... electrons.
Normally the electrons move ..................... in all directions, but if a potential difference is applied between two points on the conductor, then an ..................... is created.
This causes an ..................... to act on the charge carriers, causing them to ..................... along the conductor in a resultant direction.
Therefore we can say that a steady ..................... flows through the conductor.
3 marksThe conductor described in part (a) has a cross-sectional area of 1.1 × 10−7 m2 and the electrons have an average drift speed of 18 mm s−1.
Calculate the number density of electrons in this conductor.
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