Talk:A-level Physics/Electrons, Waves and Photons/Electric current

Specification
From the OCR GCE Physics A specification. Tick with &#10004; when you feel each part of the specification has been covered. Try not to add much more than what is in this list as it would not appear in the exam anyway. Use links to wikipedia for more depth in a topic.


 * 1) Understand electric current as a net flow of charged particles. &#10004;
 * 2) Understand the concept of charge in terms of the product of current and time. &#10004;
 * 3) Recall and use ∆Q=∆It. &#10004;
 * 4) Define the coulomb. &#10004;
 * 5) Appreciate the difference between the directions of conventional current and of electron flow. &#10004;
 * 6) Define potential difference and the volt in terms of energy transfer. &#10004;
 * 7) Recall and use V=W/Q and V=P/I &#10004;
 * 8) Sketch and explain the I/V characteristics of a metallic conductor at constant temperature, a semiconductor diode and a filament lamp. &#10004;
 * 9) Define resistance and the ohm. &#10004;
 * 10) Recall and use R=V/I &#10004;
 * 11) State Ohm’s law. &#10004;
 * 12) Define resistivity. &#10004;
 * 13) Recall and use ρ = RA/l &#10004;
 * 14) Recall and use P = I2R and P = V2/R &#10004;
 * 15) Recall and use W = IVt. &#10004;
 * 16) Sketch the variation with temperature of the resistance of a pure metallic conductor and of a negative temperature coefficient (NTC) thermistor.