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Look at the circuit diagram - OCR Gateway - GCSE Physics - Question 9 - 2019 - Paper 3
Question 9
Look at the circuit diagram. What is the current at point P in the circuit? A 2.5A B 5.0A C 7.5A D 10.0A
Worked Solution & Example Answer:Look at the circuit diagram - OCR Gateway - GCSE Physics - Question 9 - 2019 - Paper 3
Step 1
What is the current at point P in the circuit?
Answer
To determine the current at point P in the circuit, we analyze the current values given:
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Identify the total current entering the junction: The total current is provided as 10.0 A.
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Assess the branches at the junction: The junction divides into two paths: one with a current of 2.5 A and the other leading to point P.
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Apply Kirchhoff's Junction Rule: According to Kirchhoff's current law, the total current entering a junction equals the total current leaving the junction.
Therefore, we have:
Substituting the known values:
Solving for :
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Conclusion: The current at point P in the circuit is 7.5 A.