(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 potential difference is the volt. Complete the sentence by putting a cross (✗) in the box next to your answer. 1 volt is equivalent to □ 1 joule per second □ 1 joule per amp ☑ 1 joule per coulomb □ 1 joule per ohm

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

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(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) T... show full transcript

Worked Solution & Example Answer:(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 find the potential difference (V) across resistor R, we can use Ohm's Law, which states that:

$V = I imes R$

Where:

V is the potential difference (voltage) across the resistor,
I is the current through the resistor,
R is the resistance of the resistor.

First, we need to determine the current through resistor R. We know from the circuit that the total current entering the junction is 0.60 A and the current exiting the junction is 0.40 A. Therefore, the current through R is:

$I = 0.60 A - 0.40 A = 0.20 A$

Now, plug the values into Ohm's Law with R = 15 Ω:

$V = 0.20 A imes 15 Ω = 3.0 V$

Thus, the potential difference across R is 3.0 V.

Step 2

The unit of potential difference is the volt.

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Answer

A volt (V) is defined as the potential difference that will move one joule of energy per coulomb of charge. Hence, the correct selection is:

☑ 1 joule per coulomb

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

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

Calculate the potential difference across R.

The unit of potential difference is the volt.

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