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>Resistance is a result of electrons colliding with atoms & losing energy. In a battery, chemical energy is used to make electrons move & then collide so
battery has internal resistance, (warms it up). >The amount of electrical energy a battery produces for each coulomb of charge is the electromotive…

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> A potentiometer uses a variable resistor to give a variable voltage. Controlled directly by the user, by knobs or slider.
The Potential Divider

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