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A voltage follower has unity gain with an error of just 1/(1 + A), so with an open-loop gain of 100,000 the error is 10 parts per million. Its value is impedance transformation: a high-impedance source driving a low-impedance load loses most of its signal without a buffer.
Voltage follower
Vout = Vin x A / (1 + A); without a buffer Vout = Vin x ZL / (ZS + ZL)
Electrical results are planning estimates only. Verify against the applicable wiring rules (IEC 60364, BS 7671, NEC or local code) and have all installation work designed and checked by a qualified electrician.
Because it converts a weak high-impedance signal into a low-impedance one that can drive a real load without attenuation.
No. Decompensated types are only stable above a minimum gain, so check the datasheet before using one as a follower.