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Directly proportional

The current (I) represented by x variable line through a conductor is directly proportional to voltage (V) represented on Y line. As you can see as V goes up so does I at the same time.

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Directly proportional means that both variables (x, y or I, R or E, R etc.) increase(s) or decrease(s) at the same time in the same direction.

For example;

If the volume (variable y) of a fixed amount of gas (variable x) is directly proportional to absolute pressure, thus this means that when you heat a gas (x) the volume (y) also increases.

Another example;

If the fixed current (variable I) through a conductor between two points is directly proportional to the voltage (variable E) across the two points also increases.

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