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- Infinite resistance is not real. It exists theoretically. If you have zero resistance, the current will flow unimpeded. But if you have infinite resistance, the current will stop flowing. This is why multimeters respond to open circuits by displaying an ‘Infinite Resistance’ reading.
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Dec 4, 2020 · If you connect a voltage source across a superconductor a voltage will appear due to the inductance. The current will start off at zero and increase. When it reaches the critical current Jc the superconductor will go normal and will no longer have zero resistance.
- Understanding resistance in open and short circuits
The infinity means that the resistor is extremely high...
- electric circuits - Current when resistance is 0 - Physics ...
Current might rise high enough to be a danger, but it isn't...
- Understanding resistance in open and short circuits
Jul 29, 2014 · The infinity means that the resistor is extremely high resistance so it can be ignored in comparison to the much smaller resistance (s) in parallel. For the same reason, anything shorted with an ideal short might as well not be there, so in the third case it's 12V/2 Ω Ω = 6A and eventually the 5A fuse should blow.
Use Ohms law to relate resistance, current and voltage. In National 5 Physics calculate the resistance for combinations of resistors in series and parallel.
Sep 15, 2015 · Current might rise high enough to be a danger, but it isn't infinite. Even if you were to consider a superconductor as a wire (where resistance really is zero), it still has an inductance value. When resistance is very small (or zero), the inductance becomes significant.
Feb 20, 2022 · Combining the relationships of current to voltage and current to resistance gives \[I = \frac{V}{R} . \label{20.3.3}\] This relationship is also called Ohm’s law. Ohm’s law in this form really defines resistance for certain materials. Ohm’s law (like Hooke’s law) is not universally valid.
Key fact. Potential difference (or voltage) is a measure of energy, per unit of charge, transferred between two points in a circuit. A potential difference of 1 volt means that 1 joule of work is...
Mar 1, 2021 · Resistance Characteristic: The resistance of an open circuit is infinitely high since no current passes through, resulting in a calculation of voltage divided by zero.
