(a)[2]
Calculate the current through the 400 $\Omega$ resistor.
(b)[2]
Calculate the power dissipated in the 400 $\Omega$ resistor.
(c)[2]
A student uses all of the components shown in Fig. 3.1 in a different circuit. She arranges them so that the current in each resistor is as large as possible. One resistor carries a larger current than the other two. The student adds the ammeter to the circuit so that it measures the current in this resistor. Draw the circuit diagram for the arrangement. Label every resistor with its resistance value.