P = I x E is NOT Ohm's law. It is a formula for calculating power. Ohm's law defines resistance, not power.
When you increase the voltage applied to a dc motor, the current does not remain constant. It increases. Motor torque is directly proportional to current.
Now, when you increase the voltage to a dc motor with NO LOAD, it will turn faster. But that is not because it has "more power". It can go faster because there is more voltage to overcome back EMF, back EMF being proportional to speed. But the power does not increase significantly because it is producing no torque, hence it has almost no current and is consuming almost no power.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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