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

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Question 1

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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 in the circuit

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Answer

The total current entering point C is the sum of the currents through bulbs C and D. Given that 5A is the total current entering C and 3A is flowing through bulb C, we can use the equation:

ID=Itotal−IC=5A−3A=2AI_{D} = I_{total} - I_{C} = 5A - 3A = 2A

Thus, the current flowing through bulb D (ID) is 2A.

Step 2

Use Ohm's Law to find the resistance of bulb D

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Answer

Ohm's Law states that:

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

Where:

  • R is the resistance,
  • V is the potential difference (12V for this circuit), and
  • I is the current through bulb D (2A).

Thus, the resistance of bulb D can be calculated as:

RD=12V2A=6ΩR_D = \frac{12V}{2A} = 6Ω

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