What is the power of a bulb rated at $2.5 \,V$ $500\, mA$ ?
What is the power of a bulb rated at $2.5 \,V$ $500\, mA$ ?
Given, $V =2.5 V$
$I =500 mA =500 \times 10^{-3} A$
Using $\quad P=V I$, we have
$P =2.5 \times 500 \times 10^{-3}=1.25 W$
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