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The figure below shows a 12V, 24W lamp operated by a step-down transformer that is connected to a 240V mains supply.

      

The figure below shows a 12V, 24W lamp operated by a step-down transformer that is connected to a 240V mains supply.
pic10920191539.png
(i) Explain what is meant by the term ‗laminated core’ and state its significance in a transformer.
(ii) Calculate the efficiency of the transformer if the current through the primary coil is 0.12 A.

  

Answers


sharon
(i) Laminated core-made of thin sheets of insulated soft iron plates.Significance – Reduces size of eddy currents.
pic10920191542.png
sharon kalunda answered the question on September 10, 2019 at 12:43


Next: An electric filament bulb is rated 24V, 0.5A. Calculate: (i) The power of the bulb. (ii) The energy dissipated by the bulb in 80 minutes.
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