A battery has an emf of 9.20 $\mathrm{V}$ and an internal resistance of 1.20 . (a) What resistance across the battery will extract from it a power of 12.8 $\mathrm{W} ?$ (b) a power of 21.2 $\mathrm{W}$ ?
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A battery has an emf of $9.20 \mathrm{V}$ and an internal resistance of $1.20 \Omega$. (a) What resistance across the battery will extract from it a power of $12.8 \mathrm{W} ?$ (b) a power of $21.2 \mathrm{W} ?$
A battery has emf $\mathcal{E}$ and internal resistance $r=2.00 \Omega$. A $12.0 \Omega$ resistor is connected to the battery, and the resistor consumes electrical power at a rate of $96.0 \mathrm{~J} / \mathrm{s}$. What is the emf of the battery?
(II) A battery with an emf of 12.0 V shows a terminal voltage of 11.8 V when operating in a circuit with two lightbulbs, each rated at 4.0 W (at 12.0 V), which are connected in parallel. What is the battery's internal resistance?
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