I-V Graphs Explained | Resistors, Filament Lamps & Diodes (GCSE Physics)

In this video I explain I-V graphs for resistors (Ohmic Conductors), filament lamps, and diodes: an important topic for GCSE Physics, GCSE Combined Science, and IGCSE Physics - electricity.

We start by looking at common circuit components and their circuit symbols, including:

• Resistors
• Variable resistors
• Light dependent resistors (LDRs)
• Thermistors
• Diodes
• Light emitting diodes (LEDs)

We then explore Ohm’s Law and explain what it means for a component to be an ohmic conductor. This helps us understand why the I-V graph for a resistor is a straight line.

Next we compare this with the I-V graph of a filament lamp, which is non-linear because the filament heats up as the current increases, increasing the resistance.

Finally we look at diodes, components that only allow current to flow in one direction, and examine the distinctive I-V graph of a diode. The diode has a forward bias and reverse bias direction.

This video is ideal for students studying:

• GCSE Physics
• IGCSE Physics
• GCSE Combined Science: Physics

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00:00 Introduction
00:16 Circuit symbols for resistors, LDRs and thermistors
00:44 Ohmic conductors and Ohm's Law
01:15 I-V graphs for resistors
01:41 Circuit used to measure I-V graphs
02:05 Filament lamp I-V graph explained
02:24 How to describe the filament lamp graph in exams
02:49 Why the filament heats up
03:33 Diodes explained
04:13 Light emitting diodes (LEDs)
04:14 Circuit to measure diode I-V graph
04:35 Forward bias and reverse bias
05:28 Summary

#gcsephysics #gcsescience #igcsephysics
#physicsrevision #IVGraphs #electricity

Видео I-V Graphs Explained | Resistors, Filament Lamps & Diodes (GCSE Physics) канала VideoPlatoAcademy