8) A \( 40 \mathrm{v} \) circuit has a resistance of \( 80 \Omega \). How much current flows through it? How much power does the circuit use? a) \( 0.5 \mathrm{~A} \), b) \( 20 \mathrm{~W} \)

Step 1 ：I=\frac{V}{R}

Step 2 ：I=\frac{40\mathrm{v}}{80\Omega}

Step 3 ：I=0.5\mathrm{A}

Step 4 ：P=IV

Step 5 ：P=(0.5\mathrm{A})(40\mathrm{v})

Step 6 ：P=20\mathrm{W}