if you you have a constant current... how would you get a different voltage?

Question

I am wondering how exactly does octane work in vehicles and if i have if you you have a constant current... how would you get a different voltage?

Answer 1

Your question on octane was answered well by Win S, and I won't attempt to do better. But the question on constant current is easy to understand when you realize that the current flows through a resistance (or impedance) in the circuit. The voltage developed across the resistance varies as the resistance itself varies. This is Ohm's Law:

V = I R

where V is the voltage, I is the current, and R is the resistance.

Answer 2

Re: Octane- The octane number tells you how resistant the fuel is to 'knock' or 'pre-ignition' or 'ping'. Pre-ignition is what causes old carburetted gas engines to sometimes continue to run after the key is turned off (commonly called 'dieseling'). When the engine is running, it will sound like a tapping in the engine under load (foot to the floor). This 'ping' sound is created when two flame fronts (the one from the spark plug, and the 'accidental' flame front from another location) collide. The subsequent peak in cylinder pressure causes damage inside the engine over time (think of it as hitting the piston top with a hammer on every stroke). At higher compression ratios, engines are more suseptible to this knock. High compression (high performance) engines therfore require higher octane fuel to prevent it. Using higher octane than your engine requires however, is just pouring extra money in the tank. The octane number you see on the pump is an 'average' of the Research Octane and Motor Octane numbers (R+M/2). 'Research octane' is determined by specific lab tests, and 'Motor Octane' is determined by actually testing the fuel in a special 'test engine' where the compression ratio can be adjusted while the engine is running.

Answer 3

you can vary the voltage at the same current by putting resistor in the circuit.

octane is hydrocarbon, meaning it consists of hydrogen and carbon that are bonded together. the combustion inside the vehicle breaks it into carbon dioxide (some carbon monoxide), hrydrogen gas, and water. during the combustion process, it releases an energy up to the extent that moves the pistons inside the vehicle. That is why the vehicle runs.

Answer 4

octane is the burn....the higher the octane the higher the burn....
different voltage is obtained via a step up or step down transformer...it is a power converter....ex
I live in S.Korea...the normal current is 220volts, my printer is 110volts..i use a step down tranformer to operate the printer...and vice versa....some of my appliances are 220volts, and if I visit a friend that lives on the army post...he has 110volt at his house...so we use a step up transformer...

Answer 5

win s &tech dued answers are sufficent to under stand ur doubt