(a) Figure 12.23 shows a series parallel resistive circuit connected to a 320 V d.c. supply. For the circuit shown work out the following: (i) The total equivalent resistance RT of the circuit and the total current IT. (ii) The voltage Vp1 across resistors R1 and R2. (iii) The voltage Vp2 across resistors R3 and R4. (iv) The currents I1 and I3.(v) The total power for the whole circuit and the power dissipated in resistor R3 . (b) Consider the case of a heavy duty battery whose emf e = 24 V and internal resistance of r = 0.01 S. If the terminals were accidentally short circuited by a heavy copper bar of negligible resistance what power would be dissipated within the battery?