Half right. Reducing ohms does reduce heat, but if you increase volts only on the input the power dissipation goes up by the square of voltage.
When you raise the voltage on both input and output (like high tension power lines) only the difference stays the same. In that case the heat stays the same but the amount of useful power getting through the resistance is higher so the heat is a smaller fraction of the total power getting through.
Maybe my imagination is too limited, but I am not sure whether this cute illustration helps explain any of that. Maybe we should spend less time pushing analogies through tight spots and relax.
Half right. Reducing ohms does reduce heat, but if you increase volts only on the input the power dissipation goes up by the square of voltage.
When you raise the voltage on both input and output (like high tension power lines) only the difference stays the same. In that case the heat stays the same but the amount of useful power getting through the resistance is higher so the heat is a smaller fraction of the total power getting through.
Maybe my imagination is too limited, but I am not sure whether this cute illustration helps explain any of that. Maybe we should spend less time pushing analogies through tight spots and relax.