**Contents:-**

**Electric current**- understand that electric current is a flow of charge carriers
- understand that the charge on charge carriers is quantised
- define the coulomb
- recall and use \(Q = It\)
- derive and use, for a current-carrying conductor, the expression I = Anvq, where n is the number density of charge carriers
**Potential difference and power**- define potential difference and the volt
- recall and use \(V = \frac{W}{Q}\)
- recall and use \(P = VI\) and \(P = I^2R\)
**Resistance and resistivity**- define resistance and the ohm
- recall and use \(V = IR\)
- sketch and discuss the \(I-V\) characteristics of a metallic conductor at constant temperature, a semiconductor diode and a filament lamp
- state Ohm’s law
- recall and use \(R = \frac{\rho L}{A}\)

**Video (1:47:19 mins)**

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