A student investigated how the total resistance of identical resistors connected in series varied with the number of resistors - AQA - GCSE Physics - Question 4 - 2020 - Paper 1
Question 4
A student investigated how the total resistance of identical resistors connected in series varied with the number of resistors.
The student used an ohmmeter to meas... show full transcript
Worked Solution & Example Answer:A student investigated how the total resistance of identical resistors connected in series varied with the number of resistors - AQA - GCSE Physics - Question 4 - 2020 - Paper 1
Step 1
Calculate the mean resistance of 1 resistor.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To find the mean resistance of a single resistor, we use the total mean resistance of three resistors measured:
Rtotal=36.0extΩ
Since the resistors are identical, we divide the total resistance by the number of resistors:
R=nRtotal=336.0extΩ=12.0extΩ
Thus, the mean resistance of one resistor is 12.0 Ω.
Step 2
What was the resolution of the ohmmeter the student used? Tick (✔) one box.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The resolution of the ohmmeter used by the student was 0.1 Ω.
Step 3
How do the results show that the student’s measurements were precise? Tick (✔) one box.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The results indicate that the measurements were precise because the measurements are grouped closely together.
Step 4
How do the results show that the total resistance is directly proportional to the number of resistors? Tick (✔) one box.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The results show this relationship because the results give a straight line that would go through the origin.
