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Please help with one mark physics question Watch

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Size:  14.3 KBplease explain your method
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    Use the relationship between P and R.
    As you know, P=I^2R and as current is constant throughout the circuit, P \propto R
    Knowing that 1W is converted from R, you can work out using ratios the rest and therefore the output power of the cell using P_{in} = P_{out}
 
 
 
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