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The transformer
Explain how a basic transformer is built, highlighting the use of a soft-iron core for changing voltage levels.
8
Objectives
80
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56
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90 min
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CambridgeIGCSEPhysicsElectricity and magnetism
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The transformer outcomes8 objectives
- Explain how a basic transformer is built, highlighting the use of a soft-iron core for changing voltage levels.
- Identify and define the roles of primary and secondary coils, as well as the concepts of step-up and step-down transformers.
- Recall and apply the formula Vp/Np = Vs/Ns, where V and N represent voltage and number of turns for primary and secondary coils respectively.
- Discuss how transformers are utilized in the high-voltage transmission of electrical energy.
- List the benefits associated with transmitting electricity at high voltages.
- Clarify how a simple iron-cored transformer operates based on its principles.
- Recall and apply the equation for 100% efficiency in transformers, represented as Vp/Vs = Ip/Is, where V and I denote voltage and current for primary and secondary.
- Recall and utilize the equation P = I²R to explain how higher voltages lead to reduced power losses in transmission cables.
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