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If the voltage is 12V current going through the cable is 1A,
therefore the cable is delivering 12W to the load.
Assuming that the 1A is the cable's maximum capacity.
Does this means that if I need to deliver more power to the load (eg. 24W),
I can use back the same cable by using a higher voltage?
24V, delivering current of 1A.
Can I generally say that the cable is not dependent on the
amount of power delivered to the load,
but is only dependent on the current traveling through it?
The high voltages are used for power transmission lines. The power losses due to line resisatnce will be lower for high voltage (low load current) transmission lines
Can I generally say that the cable is not dependent on the
amount of power delivered to the load,
but is only dependent on the current traveling through it?
Depending on the country/region where your power supply will be used, you should ensure certain ampacity and insulation dimensions of the cable. For higher currents
you need higher cross-sectional area, think as you need less resistance per meter (=q*Length/Area). Also you will have less inductance for thicker lines.
Thank you very much everyone's guidance.
I think I can relate better now.
Imagining voltage to be like the pressure in the water pump.
Higher pressure narrower pipe,
is equivalent to a lower pressure larger pipe.
It makes sense to me now.
This depend on the current itself. But if you are talking on power transmission line this become true. It's for that reason that we use power transformers.
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