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Look at the circuit diagram - OCR Gateway - GCSE Physics - Question 1 - 2019 - Paper 3

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Look at the circuit diagram. 12V * resistance = potential difference + current Calculate the resistance of bulb D. A 2 Ω B 4 Ω C 6 Ω D 8 Ω Your answer

Worked Solution & Example Answer:Look at the circuit diagram - OCR Gateway - GCSE Physics - Question 1 - 2019 - Paper 3

Step 1

Calculate the Total Current Through the Circuit

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Answer

In this parallel circuit, the total current is given as 5A. Bulbs C and D are in parallel, with bulb C having a current of 3A. Therefore, the current through bulb D can be calculated as:

ID=Itotal−IC=5A−3A=2AI_D = I_{total} - I_C = 5A - 3A = 2A

Step 2

Use Ohm's Law to Calculate Resistance

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Ohm's Law states that:

R=VIR = \frac{V}{I}

Using the potential difference across bulb D (which is the same as the source voltage of 12V), we can calculate the resistance:

RD=12V2A=6ΩR_D = \frac{12V}{2A} = 6 \Omega

Step 3

Conclusion

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Answer

Thus, the resistance of bulb D is 6 Ω, which corresponds to option C.

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