PHYS - Electric Circuits
Physics, electric circuits - IBDP | DSE | GCE | IAL | AP Physics
Let's take a look at one IGCSE Physics past paper question on electric circuits 🔌
A student plans to measure the resistance of a piece of wire. He sets up this circuit and finds that it does not work.
(a) Identify the three errors in this circuit.
→ To correct the circuit, one of the cells should be flipped and connected, and the position of ammeter and voltmeter should change.
(b) The student uses a correct circuit to obtain these results.
(i) Plot a graph to show the relationship between current and voltage for the wire.
(ii) Find the current when the voltage is 2.5V.
From the graph, the current when the voltage is 2.5V is 0.4A.
(iii) Suggest why the line on the graph curves.
- The temperature of the wire could have changed, thus changing the resistance in the wire.
(iv) Describe what else the student should do to find an accurate value for the resistance of the piece of wire at a constant temperature.
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