(Solved): QUESTION 4 [24 marks] a. (10 marks) The circuit in Figure 7 is a regular household system of a sin ...

QUESTION 4 [24 marks] a. (10 marks) The circuit in Figure 7 is a regular household system of a single-phase three-wire circuit that allows the operation of both \( 120 \mathrm{~V} \) and \( 240 \mathrm{~V}, 60 \mathrm{~Hz} \) appliances. The circuit is protected by fuses. The fuses have negligible resistance and burn out when the circuit draws more current than its amperage rating. i. (5 marks) Calculate the currents \( I_{1}, I_{2} \) and \( I_{3} \). ii. (5 marks) A momentary short circuit causes Fuse B to burn out (i.e., it behaves like an open circuit). Calculate the new current \( I_{2} \).