The transformer

What the syllabus asks of you

• Describe the construction of a simple 6 Explain the principle of operation of a simple transformer with a soft-iron core, as used for iron-cored transformer voltage transformations
• Use the terms primary, secondary, step-up and step-down
• Recall and use the equation 7 Recall and use the equation for 100% efficiency Vp Np / Ns in a transformer Vs = IpVp = IsVs where p and s refer to primary and secondary where p and s refer to primary and secondary
• Describe the use of transformers in high- voltage transmission of electricity
• State the advantages of high-voltage 8 Recall and use the equation transmission P = I2R to explain why power losses in cables are smaller when the voltage is greater