Each resistor does appear to have a constant resistance. There are small variations in experimental data from the graph.
Q. Why does the current increase when you increase the voltage?
The difference in electric potential energy (per charge) between two points is what we have given the name voltage. Thus, the voltage directly tells us which way charges want to move – and if they can, then they will speed up in that direction, so the current will increase.
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Q. Does Resistance increase if voltage increases?
Resistance doesn’t increase directly because of Voltage. Increasing the voltage for a circuit with a given resistance increases the current flow.
Q. Do resistors change value over time?
Most resistors do not significantly change until the temperature spike from the surge approaches a problem area. You cannot measure that temperature for a 1-µsec surge, but you can measure the change in resistance before and after the surge.
Q. How do you know if resistance is constant?
A resistor is ‘Ohmic’ if as voltage across the resistor is increased, a graph of voltage versus current shows a straight line (indicating a constant resistance). The slope of the line is the value of the resistance.
Q. Can a resistor change resistance?
Instead of ordering and wanting for a resistor with a value you need you can change the resistance of a resistor by using another resistor or many. By installing resistors in a parallel or series circuit you can change the value in Ohms. Parts: You will need a few resistors.
Q. How does a resistor increase resistance?
The core of the resistor is made of a helix, or spiral, of conductive material wrapped around an insulating core. The material is very, very thin, which forces the current to slow down to pass through, providing resistance. To increase the amount of resistance, the number of loops in the spiral can be increased.
