Edexcel IGCSE Physics · Spec 2.4-2.6
Voltage, Resistance & Ohm's Law
Voltage, resistance and Ohm's law.
Physics revision video
Voltage, Resistance & Ohm's Law
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Spec 2.4-2.6
What you need to know
- Describe what voltage, or potential difference, is
- Describe what resistance is
- Use Ohm's law
Active recall
Quick check
Answer each question before opening the answer.
State Ohm's law as an equation.
Voltage = current × resistance (V = I × R).
What is potential difference (voltage)?
The energy transferred per unit charge, measured in volts (V = E ÷ Q).
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