#### AnalogueAlchemist

##### New Member

I have a question about the role of voltage in power. Why is it that higher voltages generate more energy/power ?

For example in a light bulb, if one keeps the current constant but increases the voltage the power is higher and hence more light generated. But why ? Why does voltage do this?

If for example one decreases the current as much as possible, to nano amps for example, but increases the voltage so high as to get the same amount of power as before, will the bulb shine just as bright ? Even tho current is so small ?

In transformers and long distance transmission lines, the current is so small, but the voltage is so high, yet when the signal arrives, its just a normal signal even though current was so low. But look, if the resistance of the line is high, which it is, then how do you recover a high current on the other side? Because the resistance of the line is so high, the current so low, so on the other end of course you will need higher currents for things, so how can you get a higher current from this high impedance line ?

Thanks everybody