The drawback of the mechanical-electrical analogy is that electronics are limited by the range over which the variables may vary due to the fixed supply voltage. Therefore, each problem must be scaled to its parameters and dimensions—e.g., the expected magnitudes of the velocity and the position of a spring pendulum. Improperly scaled problems might suffer from higher noise levels. Floating-point digital calculations have a huge dynamic range but might also suffer from imprecision if tiny differences of huge values lead to numerical instability.