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In electricity, there are three fundamental principals you need to grasp: current, voltage and resistance. Ohm's Law states that as long as resistance is kept constant, current and voltage is proportional. The fundamental definitions of V, I and R is crucial to learn in order to grasp the rest of the electricity chapter.

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I-V Graphs is all about showing the relationship between potential difference and current. If a conductor obeys Ohm's Law, current is proportional to voltage and the graph will be a *straight line through the origin*. Non-ohmic conductors like the filament lamp has its curve flatten out due to electrical energy turning into heat energy and causing the metal to heat up - more vibrations cause electrons to move through the component more difficultly.

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Resistance is voltage per unit current. Resistivity is porportional to resistivity. Resistivity is a measure of how much a particular material resists current flow.

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Power is defined as the amount of enegry per unit time.

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EMF is the amount of amount electrical energy converted to electrical energy per coulomb of charge. Internal resistance is the amount of volts lost per unit current.

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Jason Chan

Contact Us: thetechjason@gmail.com