$1.$ A car battery causes a current through a lamp and produces $12$ V across it as shown in Figure $4.$ What is the power used by the lamp?

$2.$ What is the current through a $\backslash (75-\backslash$mathrm$\{$W$\}\backslash )$ lightbulb that is connected to a $\backslash (125-\backslash$mathrm$\{$V$\}\backslash )$ outlet?

$3.$ The current through a lightbulb connected across the terminals of a $\backslash (125-\backslash$mathrm$\{$V$\}\backslash )$ outlet is $0\mathrm{.}50$ A $.$ At what rate does the bulb transform electrical energy to light? $($Assume $100$ percent efficiency.$)$

$4.$ The current through the starter motor of a car is $210$ A $.$ If the battery maintains $12$ V across the motor, how much electrical energy is delivered to the starter in $10\mathrm{.}0$ s $?$

$5.$ A $\backslash (75-\backslash$mathrm$\{$V$\}\backslash )$ generator supplies $3\mathrm{.}0$ kW of power. How much current can the generator delliver?

$6.$ A flashlight bulb is rated at $0\mathrm{.}90$ W $.$ If the lightbulb produces a potential drop of $3\mathrm{.}0$ V $,$ how much current goes through it$?$

$7.$ CHALLENGE $\backslash ($ A $\backslash )$ circult is changed so the potential difference across a motor doubles and the current through the lightbulb triples. How does this change the motor's power?