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PHYSICS, M4 2019 VCE 6a

A home owner on a large property creates a backyard entertainment area. The entertainment area has a low-voltage lighting system. To operate correctly, the lighting system requires a voltage of 12 \(\text{V}\). The lighting system has a resistance of 12 \(\Omega\).

Calculate the power drawn by the lighting system.  (3 mark)

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\(12\ \text{W}\)

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→ Using  \(P=IV\) and  \(I= \dfrac{I}{R} :\)

\(P\) \(=\dfrac{V^2}{R}\)  
  \(=\dfrac{12^2}{12}\)  
  \(=12\ \text{W}\)  

→ The power drawn from the lighting system is 12 \(\text{W}\).