PLease PHYSICS!! HELPPppppppp Electricity?

circuit:

---3ohm resistor----|

| ----------| |---------------|

| ---6 ohm resistor---| |

| |

x volts |

| |

| |

|--------------1 Ohm resistor----------------|







Theres 5 questions



a) whats the single resistor that can replace multiple resistors = 3



b) A current of 2.0 Amps flows through the battery. Whats the voltage , X volts supplied by the battery? = 6 V



now the ones i dont know



c) The battery is replaced by a variable power supple. The current through the power supply is measured to be 3.0Amps. What current flows through the 3.0 ohm resistor?



d) If the power supply settings is changed so that it supplies 300C of charge in 90 seconds whats the current in the 1 ohm resistor?



e) The power supply is changed again so that 3600 J (whats J?) or energy is dissipated(whats mean?) in the 1 ohm resistor in 9- seconds. Whats the power dissipation in this resistor?



Please provide detailed instructions on how to work out the last 3 questions please hellpppppPLease PHYSICS!! HELPPppppppp Electricity?
I am sorry i can not solve the problem it is long time that i did not do problem solving .its more than 35 years ago , but practically i have an idea what it is and applying to my daily life,PLease PHYSICS!! HELPPppppppp Electricity?
c) The parallel resistance is 2.0 ohms; 3.0 amps flow through them, so the voltage across the parallel resistors will be 3.0*2.0 = 6 .0 v, The voltage in the 3.0 ohm resistor is then 6.0/3.0 = 2.0 amps



d) 300C in 90 sec is 300/90 amps. All of it flow through the 1.0 ohm resistor



e) 3600 J (J = joules, an energy unit) One watt is one J per second. The watts dissipated is then 3600/9 watts.