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6 (a) The diagram shows a circuit with two resistors, R and S - Edexcel - GCSE Physics - Question 6 - 2018 - Paper 1

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6 (a) The diagram shows a circuit with two resistors, R and S. (i) Calculate the potential difference across R. R has a resistance of 15 Ω. (ii) The unit of poten... show full transcript

Worked Solution & Example Answer:6 (a) The diagram shows a circuit with two resistors, R and S - Edexcel - GCSE Physics - Question 6 - 2018 - Paper 1

Step 1

Calculate the potential difference across R.

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Answer

To calculate the potential difference (V) across resistor R, we can use Ohm's law, which states that:

V=IimesRV = I imes R

Given that the current (I) through R is 0.4 A (from the circuit diagram), and the resistance (R) is 15 Ω, we can substitute these values into the formula:

V=0.4imes15V = 0.4 imes 15

Calculating this gives:

V=6.0extVV = 6.0 ext{ V}

Step 2

Complete the sentence by putting a cross (✗) in the box next to your answer.

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Answer

1 volt is equivalent to:

☐ 1 joule per second ☑ 1 joule per amp ☐ 1 joule per coulomb ☐ 1 joule per ohm

The correct answer is C: 1 joule per coulomb.

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