A-Level Physics OCR A H556

resistance; $R = \dfrac{V}{I}$; the unit ohm

Learners will also be expected to recall this equation.

Ohm’s law

(i) I–V characteristics of resistor, filament lamp, thermistor, diode and light-emitting diode (LED)

(ii) techniques and procedures used to investigate the electrical characteristics for a range of ohmic and non-ohmic components.

PAG3

light-dependent resistor (LDR); variation of resistance with light intensity.