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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 flowing through the resistor R using a moving coil ammeter. This will prov... 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
Student B repeated the investigation. During Student B's investigation the temperature of resistor R increased. Explain how the increased temperature of resistor R would have affected Student B's results.
Answer
The increased temperature of resistor R would have affected Student B's results by causing the resistance of R to increase. According to Ohm's Law, if the resistance increases while the p.d. remains constant, the current flowing through the circuit would decrease. This would result in a non-linear relationship between current and potential difference, leading to a distorted graph that does not accurately represent the circuit's behavior under normal operating conditions.
Step 3
Student B replaced the moving coil ammeter with a digital ammeter. Give one other reason why it would have been better to use the digital ammeter throughout this investigation.
Answer
Using a digital ammeter would provide a reading closer to the true value with less chance of misreading, as digital displays minimize parallax errors associated with analog meters.