An investigator has four pieces of resistance wire made of the same metal alloy. Each piece is connected in turn between two terminals, X and Y, in a simple series circuit.
| Wire | Length of wire / m\text{m}m | Diameter of wire / mm\text{mm}mm |
|---|---|---|
| A | 2.0 | 1.0 |
| B | 2.0 | 2.0 |
| C | 4.0 | 1.0 |
| D | 4.0 | 2.0 |
In which wire is the current in the circuit the smallest?
A
B
C
D
132 exam-style questions on CIE IGCSE Physics 4.2.4a Resistance. Each one has a worked solution and a mark scheme showing where the marks go.