If it had a low input impedance, the voltage may not drop across it and it would not receive the signal. To make sure that the voltage signal drops fully on the op amp, it must have a very high input impedance, so that the voltage drops fully across it. So the greater the resistance (or impedance) of a device, the greater the voltage drop across that device is. If you know the concept of a voltage divider, voltage drops primarily across components with high impedances, proportionally according to ohm’s law by the formula V=IR.
In order for an op amp to receive the voltage signal as its input, the voltage signal must be dropped across the op amp. They amplify a voltage fed into the op amp and give out the same signal as output with a much larger gain.
In electronics, op amps are voltage gain devices. The input terminal of an ideal operational amplifier does not have any current to flow in. The so-called ideal op amp is to idealize various technical indicators of op amps, and it must have the following characteristics. When analyzing various application circuits of operational amplifiers, the integrated operational amplifier is often regarded as an ideal operational amplifier. And meanwhile, it can be further simplified into an ideal op amp model, referred to as an ideal op amp (also called ideal OPAMP). In addition, it has positive and negative inputs which allow circuits that use feedback to achieve a wide range of functions. In electronics, the open-loop voltage gain of the actual operational amplifier is very large, which can be seen a differential amplifier with infinite open loop gain, infinite input resistance and zero output resistance. Operational amplifier (op amp for short) is basically a voltage amplifying device designed to be used with components like capacitors and resistors, between its in/out terminals, or is simply a linear Integrated Circuit (IC) having multiple-terminals.
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