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Electricity answer explanations

Review worked answers and explanations for Electricity. Aligned to OCR Gcse Physics A Gateway.

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a. State State the relationship between potential difference (V), current (I), and resistance (R). [1 marks] b. Calculate A resistor has a potential difference of 12 V across it when a current of 0.5 A flows through it. Calculate the resistance of the resistor. [3 marks] c. Explain For some resistors, the value of resistance remains constant, but for others, it can change as the current changes. Explain what type of resistor would have a constant resistance and give an example of a component where resistance changes with current. [3 marks]

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