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Electrical Circuits and Symbols — Free MYP3 Sciences Practice Questions
1QuestionBuilding and Testing Simple CircuitsConcept Practice
2 marks~3 minCriterion B
A student investigates how the number of cells connected in series affects the brightness of a bulb. She tests circuits with 1, 2, and 3 cells, keeping the same bulb, wires, and circuit layout throughout.
a
Identify the independent variable and the dependent variable in this investigation. [1]
b
Identify one controlled variable and explain why keeping it constant makes this a fair test. [1]
Solutions
2QuestionComponents of a Simple CircuitAssessment Practice
4 marks~6 minCriterion C
The diagram shows a simple circuit with a battery, two connecting wires, a bulb, and a switch. The switch is open and the bulb is off.
a
State what an open switch does to the circuit pathway. [1]
b
Explain why the bulb does not light up when the switch is open. [2]
c
A student claims that closing the switch will make the bulb light up only if the wires are made of metal. Assess whether this claim is correct, and justify your answer using your knowledge of conductors and circuit operation. [1]
Solutions
3QuestionComponents of a Simple CircuitAssessment Practice
6 marks~9 minCriterion A
A student connects identical bulbs in parallel to a battery and records the following results.
| Number of bulbs | 1 | 2 | 3 |
|---|---|---|---|
| Current through each bulb (A) | 0.30 | 0.30 | 0.30 |
| Total current from battery (A) | 0.30 | 0.60 | 0.90 |
a
Describe the pattern shown in the data for the current through each bulb and for the total current from the battery. [2]
b
Explain why each bulb receives the same current regardless of how many bulbs are connected in parallel. [2]
c
A fourth identical bulb is added in parallel. Calculate the new total current from the battery, and analyse what effect this has on the brightness of each bulb. [2]
Solutions
4QuestionBuilding and Testing Simple CircuitsAssessment Practice
8 marks~12 minCriterion D
A school science lab uses copper wires in its circuits. The budget committee proposes switching to aluminium wires, which are cheaper and lighter but have higher resistance. Copper mining produces significant CO2 emissions; aluminium recycling requires more energy than copper recycling.
a
Explain how replacing copper with aluminium wires would affect the heating of the wires at the same current. Use the formula in your answer. [3]
b
Explain one ethical trade-off the school must consider when choosing between copper and aluminium wires. [2]
c
Analyse the environmental impact of this proposal, considering both mining and recycling. Identify one limitation of your analysis. [3]
Solutions
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