Pearson Edexcel International GCSE
Physics — Topic 2 Paper 1
Electricity · specification 2.1–2.21
Time allowed: 30 minutes
Total marks: 25
Candidate name:
Centre / class:
Answer all questions. You may use a calculator. Show your working. Standard fuse ratings are $3\,\text{A}$, $5\,\text{A}$ and $13\,\text{A}$.
1
A $12\,\text{V}$ battery is connected to resistor A of $4.0\,\Omega$ and resistor B of $8.0\,\Omega$ in series.
(a) Calculate the current in the circuit.
[2]
(b) Calculate the voltage across resistor B.
[2]
(c) The two resistors are now connected in parallel across the same $12\,\text{V}$ battery. State the voltage across resistor A and calculate the current through resistor A.
[2]
(Total for Question 1 = 6 marks)
2
A kitchen kettle is labelled $230\,\text{V}$, $1840\,\text{W}$.
(a) Calculate the current in the kettle when it is used on the mains.
[2]
(b) Choose the most appropriate fuse for the kettle. Explain your choice.
[2]
(c) The kettle is used for $3.0\,\text{minutes}$. Calculate the energy transferred.
[2]
(Total for Question 2 = 6 marks)
3
A student investigates how the current in a length of metal wire varies with the voltage across it.
(a) Describe a circuit the student should use. State where the ammeter and the voltmeter are placed.
[3]
(b) The table shows some of the student’s results.
| Voltage / V | 0 | 1.0 | 2.0 | 3.0 | 4.0 |
|---|---|---|---|---|---|
| Current / A | 0 | 0.20 | 0.40 | 0.60 | 0.80 |
(i) Calculate the resistance of the wire when the voltage is $2.0\,\text{V}$.
[2]
(ii) State whether the wire is ohmic. Use the data to explain your answer.
[2]
(Total for Question 3 = 7 marks)
4
A light-dependent resistor (LDR) is connected in series with a fixed resistor and a $6.0\,\text{V}$ battery.
(a) State what happens to the resistance of the LDR when the light intensity on it increases.
[1]
(b) Explain what happens to the current in the circuit when the room becomes brighter. The battery voltage stays the same.
[2]
(c) A current of $40\,\text{mA}$ flows in the circuit for $25\,\text{s}$. Calculate the charge transferred.
[3]
(Total for Question 4 = 6 marks)
END OF PAPER 1