Electrical Resistance Explained: Ohm’s Law, V=IR & Resistors (GCSE Physics)

Описание: Electrical resistance explained clearly for GCSE Physics, GCSE Combined Science and IGCSE Physics students. Learn what resistance is, why it happens, and how to use Ohm’s Law (V=IR) to solve exam questions.

In this lesson, you'll learn:

• What electrical resistance is
• Why resistance occurs in wires and components
• The symbol and unit for resistance (ohms, Ω)
• Ohm’s Law explained: V = IR
• How to calculate resistance, current, and voltage
• How resistance behaves in series circuits
• How wire length and thickness affect resistance

This is essential knowledge for GCSE Physics, IGCSE Physics, Combined Science, and equivalent international courses.

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• Exam questions and worked solutions
• Full lesson videos
• Revision resources for GCSE, IGCSE and A-Level Physics

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Timestamps

00:00 What is electrical resistance?
00:25 Symbol and unit (ohm, Ω)
00:48 Ohm’s Law explained (V = IR)
01:16 What resistors do
01:21 Example calculation: finding resistance
02:03 Example calculation: finding current
02:29 Resistance in series circuits
03:15 How wire length affects resistance
03:43 How wire thickness affects resistance

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