A student uses this circuit to investigate how the current in a filament lamp varies with the potential difference (voltage) across the lamp - Edexcel - GCSE Physics - Question 5 - 2016 - Paper 1
Question 5
A student uses this circuit to investigate how the current in a filament lamp varies with the potential difference (voltage) across the lamp.
(a) Add a voltmeter to... show full transcript
Worked Solution & Example Answer:A student uses this circuit to investigate how the current in a filament lamp varies with the potential difference (voltage) across the lamp - Edexcel - GCSE Physics - Question 5 - 2016 - Paper 1
Step 1
Add a voltmeter to the circuit that can be used to measure the potential difference (voltage) across the lamp.
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 measure the potential difference across the lamp, the voltmeter should be connected in parallel with the lamp.
Step 2
Complete the sentence by putting a cross (✗) in the box next to your answer.
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 correct answer is: A
12 joules per coulomb.
Step 3
When the variable resistor is at the halfway position, the ammeter reads 0.37 A and the voltmeter reads 40 V. Show that the resistance of the filament in the lamp is about 11 Ω.
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
Using Ohm’s Law, where resistance (R) is calculated as:
