Specifically a force. Gravity is the
name for a force between masses that we can feel and measure. Early workers observed that
bodies in "certain electrical condition" also exerted forces on one another that
they could measure, and they invented charge to explain their observations. Amazingly,
only three simple postulates or assumptions, plus some experimental observations, are
necessary to explain all electrical phenomena. Everything: currents, electronics, radio
waves, and light. Not many things are so simple, so it is worth stating the three
postulates clearly.
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