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13.2 Transformers and the National Grid

Question 6

An ideal step-up transformer at a power station links the generators to the high-voltage transmission lines of the national grid. The alternating current in the primary coil is $kA2.4\text{ kA}$ and the alternating current in the secondary coil is 80 A.

What are the ratios of the primary-to-secondary voltage, $VpVs\displaystyle \frac{V_p}{V_s}$ , and the primary-to-secondary turns, $NpNs\displaystyle \frac{N_p}{N_s}$ , for this transformer?

$VpVs=30\frac{V_p}{V_s} = 30$ and $NpNs=30\frac{N_p}{N_s} = 30$

$VpVs=130\frac{V_p}{V_s} = \frac{1}{30}$ and $NpNs=30\frac{N_p}{N_s} = 30$

$VpVs=130\frac{V_p}{V_s} = \frac{1}{30}$ and $NpNs=130\frac{N_p}{N_s} = \frac{1}{30}$

$VpVs=30\frac{V_p}{V_s} = 30$ and $NpNs=130\frac{N_p}{N_s} = \frac{1}{30}$

Markscheme

13.2 Transformers and the National Grid Questions

GCSE
Physics
13.2 Transformers and the National Grid

28 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid. Each one has a worked solution and a mark scheme showing where the marks go.

13.2 Transformers and the National Grid

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13.2 Transformers and the National Grid

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Question 6

What are the ratios of the primary-to-secondary voltage, $VpVs\displaystyle \frac{V_p}{V_s}$ , and the primary-to-secondary turns, $NpNs\displaystyle \frac{N_p}{N_s}$ , for this transformer?

$VpVs=30\frac{V_p}{V_s} = 30$ and $NpNs=30\frac{N_p}{N_s} = 30$

$VpVs=130\frac{V_p}{V_s} = \frac{1}{30}$ and $NpNs=30\frac{N_p}{N_s} = 30$

$VpVs=130\frac{V_p}{V_s} = \frac{1}{30}$ and $NpNs=130\frac{N_p}{N_s} = \frac{1}{30}$

$VpVs=30\frac{V_p}{V_s} = 30$ and $NpNs=130\frac{N_p}{N_s} = \frac{1}{30}$

Markscheme

13.2 Transformers and the National Grid Questions

GCSE
Physics
13.2 Transformers and the National Grid

28 exam-style questions on Edexcel GCSE Physics 13.2 Transformers and the National Grid. Each one has a worked solution and a mark scheme showing where the marks go.