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QLDPhysicsQuick questions
Unit 1: Thermal, nuclear and electrical physics
Quick questions on Electric current, potential difference and Ohm's law (QCE Physics Unit 1)
9short 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 electric current?Show answer
The rate of flow of electric charge:
What is potential difference?Show answer
The work done per unit charge moved between two points:
What is resistance?Show answer
The opposition to current flow:
What is iA1?Show answer
Often an ohm-meter reading or an unseen I-V graph asking for the resistance at a stated point and whether the device is ohmic.
What is eA Paper 1?Show answer
Multiple choice on the units, the formula, and identifying ohmic from non-ohmic shapes.
What is eA Paper 2?Show answer
Combined with the power-and-energy and series-and-parallel dot points to find unknown resistors or currents in a small circuit.
What is q1?Show answer
Define electric current and potential difference, and state Ohm's law. [3 marks]
What is q2?Show answer
A kettle draws . Calculate the resistance of the heating element and the charge through it in . [3 marks]
What is q3?Show answer
A student measures across a filament lamp at six currents and finds vs curves upward. (a) Define an ohmic conductor. (b) Explain why the lamp is non-ohmic.