A student investigated how the current in a resistor varies with the potential difference across the resistor - AQA - GCSE Physics Combined Science - Question 1 - 2019 - Paper 1
Question 1
A student investigated how the current in a resistor varies with the potential difference across the resistor.
Figure 1 shows part of the circuit used.
The student... show full transcript
Worked Solution & Example Answer:A student investigated how the current in a resistor varies with the potential difference across the resistor - AQA - GCSE Physics Combined Science - Question 1 - 2019 - Paper 1
Step 1
What is the correct way to connect the ammeter and the voltmeter into the circuit?
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Answer
The ammeter should be connected in series with the resistor, and the voltmeter should be connected in parallel with the resistor.
Step 2
How did increasing the resistance affect the current in the circuit?
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Answer
Increasing the resistance will cause the current to decrease.
Step 3
How should the student change the circuit to give negative values for current and potential difference?
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Answer
The student should reverse the connections to the cell.
Step 4
Name the type of relationship between current and potential difference for a resistor at constant temperature.
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Answer
The relationship is directly proportional.
Step 5
Write the equation which links current, potential difference and resistance.
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Answer
The equation is: potential difference = current × resistance, or V = IR.
Step 6
Calculate the resistance of the resistor.
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