Photo AI
Describe a method that Student A could use for this investigation - AQA - GCSE Physics - Question 11 - 2021 - Paper 1
Question 11
Describe a method that Student A could use for this investigation. 1. Measure the current in resistor R using an ammeter. 2. Measure the potential difference (p.d.)... show full transcript
Worked Solution & Example Answer:Describe a method that Student A could use for this investigation - AQA - GCSE Physics - Question 11 - 2021 - Paper 1
Step 1
Describe a method that Student A could use for this investigation.
Answer
-
Measure the current in resistor R using an ammeter to assess how much current is flowing.
-
Measure the potential difference (p.d.) across resistor R using a voltmeter to determine the voltage drop across the resistor.
-
Vary the resistance of the variable resistor to systematically change the conditions and record a range of values for both current and potential difference, allowing for a thorough investigation of the behavior of the resistor under different loads.
-
Ensure that the current in the circuit is low to minimize the risk of an increase in temperature, which could affect the resistance of the resistor and skew results.
-
Switch off the power supply or disconnect it between readings to ensure that the resistor does not experience prolonged heating, maintaining accurate measurements.
-
Finally, plot a graph of current against p.d. to visualize the relationship and analyze the data effectively.
Step 2
Explain how the increased temperature of resistor R would have affected Student B’s results.
Answer
The increased temperature of resistor R would have led to an increase in its resistance. Consequently, as the resistance increases, the relationship between the current and potential difference would no longer be linear. Therefore, when plotting the I-V graph, it would exhibit a curvature instead of being straight, ultimately affecting the analysis of the circuit and leading to potentially incorrect conclusions.
Step 4