What you’ll learn8 learning objectivesChoose one objective for a focused lesson, or study the complete topic.9.3.1Resistance• define resistanceSyllabus objective9.3.2V = IR• recall and use V = IRSyllabus objective9.3.3The I–V characteristics of a metallic conductor at constant temperature, a• sketch the I–V characteristics of a metallic conductor at constant temperature, a semiconductor diode and a filament lampSyllabus objective9.3.4That the resistance of a filament lamp increases• explain that the resistance of a filament lamp increases as current increases because its temperature increasesSyllabus objective9.3.5Ohm’s law• state Ohm’s lawSyllabus objective9.3.6R = ρL / A• recall and use R = ρL / ASyllabus objective9.3.7The resistance of a light-dependent resistor (LDR) decreases• understand that the resistance of a light-dependent resistor (LDR) decreases as the light intensity increasesSyllabus objective9.3.8The resistance of a thermistor decreases as the temperature increases (it• understand that the resistance of a thermistor decreases as the temperature increases (it will be assumed that thermistors have a negative temperature coefficient)Syllabus objective