Humans were essentially hunters and gatherers. They had developed the use of fire. B â¦ ut they did not live a settled existence, instead following herds of animals on their migrations which were their primary source of food. Men were the hunters and responsible for the group's primary food source.
Emf - is the amount of energy of any form that is changed into electrical energy per coulomb of charge. pd - is the amount of electrical energy that is changed into other forms of energy per coulomb of charge. Sources of emf: Cell, battery (a combination of cells), solar cell, generator, dynamo, thermocouple.
home / study / engineering / electrical engineering definitions / electromotive force. The standard unit of electromotive force (EMF) is the volt. Engineers abbreviate the word âvoltâ or âvoltsâ as V. An EMF of 1 volt (1 V) across a component with a resistance of 1 ohm drives a current of 1A through that component. If the term âelectromotive forceâ seems esoteric, think of it as âelectrical pressure.â Most people call it voltage.