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VICPhysicsQuick questions
Unit 1: What ideas explain the physical world?
Quick questions on Electric current, potential difference and Ohm's law (VCE Physics Unit 1)
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is filament lamp?Show answer
As current flows, the filament heats up and its resistance rises. I-V graph curves so that the slope decreases at higher .
What is semiconductor diode?Show answer
Zero current below the threshold voltage (about V for silicon). Near-vertical above. Strongly direction-dependent (only conducts one way).
What is thermistor?Show answer
A semiconductor whose resistance falls steeply with temperature. Used in temperature sensors. The I-V curve is concave up.
What is q1?Show answer
Define electric current and state its SI unit. [2 marks]
What is q2?Show answer
A V battery delivers a current of A through an unknown resistor for minutes. Calculate (a) the resistance, and (b) the total charge that has flowed. [2+2 marks]
What is q3?Show answer
A filament lamp shows a non-linear voltage-current graph. (a) Define an ohmic conductor. (b) Explain why a tungsten lamp behaves non-ohmically.
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