An ideal transformer initially has 600 turns on its primary coil and 100 turns on its secondary coil. Its secondary potential difference is 20 V and its secondary current is 3.0 A.
The primary turns are doubled and the secondary turns are tripled. The primary potential difference and the output power remain unchanged.
What are the new secondary potential difference and secondary current?
30 V30\ \mathrm{V}30 V and 2.0 A2.0\ \mathrm{A}2.0 A
30 V30\ \mathrm{V}30 V and 4.5 A4.5\ \mathrm{A}4.5 A
120 V120\ \mathrm{V}120 V and 0.50 A0.50\ \mathrm{A}0.50 A
120 V120\ \mathrm{V}120 V and 18 A18\ \mathrm{A}18 A
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.