We have had several questions lately about what happens if we connect a perfect short across an ideal voltage source.
This has been likened to the ancient "irresistible force meets immovable object" saw.
The difference is that Newton's Laws in mechanics provides a resolution to this issue in mechanics.
There are, however, no equivalent Laws in electrics so we must look elsewhere for resolution.
So consider these two questions side by side.
In mechanics acceleration is proportional to applied force, the constant of proportionality being mass.
In electrics current is proportional to applied electromotive force, the constant of proportionality being resistance.
A 9N force is applied to a body with a result of zero acceleration. Determine the mass. Suggest a realisation of this mechanism.
A 9 volt emf is applied to a circuit but that zero current flows. Determine the resistance. Suggest a realisation of this circuit.
This has been likened to the ancient "irresistible force meets immovable object" saw.
The difference is that Newton's Laws in mechanics provides a resolution to this issue in mechanics.
There are, however, no equivalent Laws in electrics so we must look elsewhere for resolution.
So consider these two questions side by side.
In mechanics acceleration is proportional to applied force, the constant of proportionality being mass.
In electrics current is proportional to applied electromotive force, the constant of proportionality being resistance.
A 9N force is applied to a body with a result of zero acceleration. Determine the mass. Suggest a realisation of this mechanism.
A 9 volt emf is applied to a circuit but that zero current flows. Determine the resistance. Suggest a realisation of this circuit.
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