Answer:
Total resistance = 270.4 ohm
Step-by-step explanation:
In series connection, the total resistance can be calculated by adding all the resistances.
We have:
wire resistance = 0.4 ohm
bulb resistance = 150 ohm
rheostat resistance = 120 ohm
Adding up all the resistances, we can get the total resistance of the circuit as follows:
Total resistance = 0.4 + 150 + 120 = 270.4 ohm
Hope this helps :)