If two 4 ohm resistors are connected in series which are powered by 240 volts power source, what is the current flow across one 4 ohm resistor?

Total resistance of the circuit = 4 + 4 = 8 ohms
Current flow in the circuit = 240 /8 = 30 amperes
In series circuit flow in the circuit elements is same. so 30 amperes current will flow in both series resistors.