Correct Answer - Option 4 : Pressure
The followed is:
Ammeter, instrument for measuring either direct or alternating electric current, in amperes.
Similarly,
Barometer is a scientific instrument used to measure pressure.
Pressure is related to barometer in the same way as the second word is related to the first one.
Hence, the correct answer is "Pressure".
Instrument |
Measured Unit |
Ammeter |
Current |
Voltage |
Voltmeter |