I understand voltage is pressure and amps is current but how does different voltage work or more efficient for some items?
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It all depends on the power output needed by the appliance.
Power, usually referred to in the unit Watts for electricity, Watts = Volts * Amps.
By transmitting the electricity at a higher voltage you don’t need as many amps to deliver the same wattage. This can be more efficient because with higher amps you can lose more energy to heat in the wires, as the higher the current the more resistance it will experience from the conductors which will turn into heat, and you need thicker wires to carry more current.
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