A technician checks three transformers used for equipment on a marine research vessel. The Table shows the readings and coil data.
| Transformer | Potential difference across primary coil / V\text{V}V | Number of turns on primary coil | Number of turns on secondary coil | Potential difference across secondary coil / V\text{V}V |
|---|---|---|---|---|
| A | 24 | 300 | 24 | |
| B | 12 | 600 | 72 | |
| C | 800 | 200 | 15 |
Use the equation
VPVS=NPNS\displaystyle \frac{V_P}{V_S} = \frac{N_P}{N_S}VSVP=NSNP
Complete the Table.
Identify the transformer that reduces the potential difference.
In one test, a current of 0.90 A enters the primary coil of transformer B. The transformer dissipates no energy.
Calculate the current supplied by its secondary coil.
Use the equation
VP×IP=VS×ISV_P \times I_P = V_S \times I_SVP×IP=VS×IS
108 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid, covering 13.2.1 Transformers and induction, 13.2.2 The transformer turns-ratio equation, 13.2.3 The National Grid, 13.2.4 The transformer power equation, and 13.2.5 Advantages of high-voltage transmission. Each one has a worked solution and a mark scheme showing where the marks go.