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Describe a method that Student A could use for this investigation - AQA - GCSE Physics - Question 3 - 2021 - Paper 1
Question 3
Describe a method that Student A could use for this investigation. 1. Measure the current in resistor R using an ammeter. Connect the ammeter in series with the res... show full transcript
Worked Solution & Example Answer:Describe a method that Student A could use for this investigation - AQA - GCSE Physics - Question 3 - 2021 - Paper 1
Step 1
Student B repeated the investigation.
Answer
As the temperature of resistor R increases, its resistance tends to change. Specifically, for metallic resistors, the resistance generally increases with temperature. Consequently, the current measured during Student B's investigation would decrease for the same potential difference applied across the resistor, leading to possibly non-linear results. This means that the I-V characteristics might no longer obey Ohm's Law, thus affecting the data collected.
Step 2
Step 3
Give one other reason why it would have been better to use the digital ammeter throughout this investigation.
Answer
One reason for using the digital ammeter is that it has less chance of misreading the values, compared to the analog ammeter. Digital displays can provide clear readings without parallax error, making it easier to obtain accurate measurements.