But breakfast would take four times longer: P = E²/R
If R is fixed, and voltage E is reduced by a factor of 2, then power P
goes down by a factor of 4.
A more clever design with two heating elements would put those elements
either in series or parallel, depending on the voltage, and operate at
But then you do have to ask the question: for those appliances which are
purely ON or OFF like a toaster, a water-boiling kettle or a simple radiant
electric fire, what is the point of including sophisticated circuitry just
to switch between voltages and probably adding considerably to the
Given the way things are, we are stuck with different styles of power
plugs for the different mains voltages. With some clever design, this
problem could be turned into a solution. One could have a power cord with
a mains end and an appliance end, with connectors that are not standard
mains
*From:* John Allen
*Sent:* Tuesday, May 07, 2013 12:14
what is the point of including “sophisticated” circuitry
Judging from historical appliance development, a clock. Judging from the
direction of things, to turn your toaster off without your foreknowledge or
permission because your using
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