Physics Topic: Current Electricity
Show an understanding that electric current is the rate of flow of charged particles.
Define charge and the coulomb.
Recall and solve problems using the equation Q = It.
Define potential difference and the volt.
Recall and solve problems using V = W/Q.
Recall and solve problems using P = VI, P = I 2R.
Define resistance and the ohm.
Recall and solve problems using V = IR.
Sketch and explain the I-V characteristics of a metallic conductor at constant temperature, a semiconductor diode and a filament lamp.
Sketch the temperature characteristic of a thermistor.
Recall and solve problems using R=pL/A.
Define e.m.f. in terms of the energy transferred by a source in driving unit charge round a complete circuit.
Distinguish between e.m.f. and p.d. in terms of energy consideration.
Show an understanding of the effects of the internal resistance of a source of e.m.f. on the terminal potential difference and output power.