A student connects two resistors, P and Q, in parallel with a battery.
Ammeter A1 is in the main part of the circuit. Ammeter A2 is in series with resistor P. Ammeter A3 is in series with resistor Q.
The Table shows the readings on two of the ammeters.
Table
| Ammeter | Reading in A\text{A}A |
|---|---|
| A1 | 0.75 |
| A2 | 0.25 |
| A3 |
Determine the reading on ammeter A3.
Give a reason for your answer to (a).
The potential difference of the battery is 6.0 V.
Calculate the resistance of resistor P.
State which resistor, P or Q, has the greater resistance.
Explain your answer using the Table.
81 exam-style questions on Edexcel GCSE Physics 10.2 Resistance, covering 10.2.1 Current in a circuit and conservation at junctions, 10.2.2 Resistance and variable resistors, 10.2.3 Series and parallel resistance, 10.2.4 I–V characteristics of components, and 10.2.5 LDRs and thermistors. Each one has a worked solution and a mark scheme showing where the marks go.