Physics 0625 · IGCSE · Electrical quantities

Electrical quantities — practice question

A $24\ \text{V}$ power supply, together with a $100\%$ efficient transformer, is used to power a $6.0\ \text{V}$, $12\ \text{W}$ lamp. What is the current in the power supply?

  • A$0.50\ \text{A}$
  • B$2.0\ \text{A}$
  • C$3.0\ \text{A}$
  • D$8.0\ \text{A}$

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