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Electricity and D.C. Circuits
Quick questions on Current, voltage and resistance explained: O-Level Physics
5short 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
Electric current is the rate of flow of electric charge:
What is potential difference (voltage)?Show answer
Potential difference, or voltage, is the energy transferred per unit charge as charge moves between two points:
What is q1?Show answer
Define electric current and state its unit. [2 marks]
What is q2?Show answer
A supply drives a current of through a resistor. Calculate its resistance. [2 marks]
What is q3?Show answer
Explain why the current-voltage graph of a filament lamp is a curve rather than a straight line. [2 marks]
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