IP Physics Notes (Upper Secondary, Year 3-4): 11) Current of Electricity

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30 Sep 2025, 00:00 Z

Q: What does IP Physics Notes (Upper Secondary, Year 3-4): 11) Current of Electricity cover?
A: Relate charge flow, potential difference, resistance, and I-V characteristics to core IP circuit analysis.

Quick recap - Electric current measures how quickly charge moves. Define the energy supplied (emf) and used (p.d.), then apply Ohm's law, resistivity relations, and characteristic curves to decode circuit behaviour.

Keep your practice loop tight via our IP Physics tuition hub-it links each topic here to quizzes, diagnostics, and WA-style problem sets.

Charge & Current

Charge $Q$ measured in coulombs; $1$ electron carries $-1.6 \times 10^{-19} \pu{C}$

Component	Graph	Key behaviour
Metal resistor	Straight line through origin	Constant $R$ ; obeys Ohm's law
Filament lamp	Curve flattening at higher $V$	Heating raises ( R ); gradient decreases
Semiconductor diode	Nearly zero current reverse bias; sharp rise beyond threshold (~ $\pu{0.6 V}$ )	Conducts mainly in one direction

IP Physics Notes (Upper Secondary, Year 3-4): 11) Current of Electricity

Charge & Current

Electromotive Force vs Potential Difference

Resistance & Ohm's Law

Worked Example: Calculating Resistivity

I-V Characteristics to Memorise

Practical Measurement Tips

Practice Quiz

Key Takeaways

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