3 ms·
Yes always annoying when amperage is discussed without voltage, it's like when people focus on torque rather than horsepower and conflate torque with power.
by SigmundA 11y ago
Yes always annoying when amperage is discussed without voltage, it's like when people focus on torque rather than horsepower and conflate torque with power.
- deelowe 11y agoNot always. V=IR. More amperage means that resistance has a more significant affect. This is why transmission lines are ran at high voltages. You can get away with smaller wire sizes and significantly less thermal loss. The first thing I think about when I see 4Ka is that any wires used would be enormous.
- jschwartzi 11y agoV=IR only holds for direct current. The transmission lines can be run at high voltages and relatively small diameters because they carry alternating current, which is a much more efficient way of transmitting electrical energy over long distances. If they were DC then they would be sized more like sewer pipes.
- upofadown 11y agoV=IR works perfectly well for AC just as long as you measure the AC in terms of RMS voltage and current. For sinusoidal AC the result is about 0.7 the peak value. There would be no significant difference in wire size. DC is in fact the better way to transmit energy over long distances. The computer I am typing this on is powered by energy transmitted 900 km in the form of DC.