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The chemical effect of current is used in
D.C. ammeter hour meter
D.C. ammeter
D.C. energy meter
None of the above
D.C. ammeter hour meter
Quick Summary: The chemical effect of electric current, based on Faraday's Laws of Electrolysis, is utilized in DC Ampere-hour meters (electrolytic meters). These devices measure the total quantity of electricity (charge) passed through a circuit over a period of time, where the mass of material deposited is proportional to the current-time integral.
The chemical effect of electric current, based on Faraday's Laws of Electrolysis, is utilized in DC Ampere-hour meters (electrolytic meters). These devices measure the total quantity of electricity (charge) passed through a circuit over a period of time, where the mass of material deposited is proportional to the current-time integral.
m=ZIt — mass liberated proportional to current I and time t
Q=∫Idt — total quantity of charge measured by the electrolytic meter
The principle relies on Faraday's first law of electrolysis, which states that the mass m of a substance liberated at an electrode is proportional to the quantity of electricity Q passed through the electrolyte. Since Q=∫Idt, the amount of substance deposited corresponds directly to the total Ampere-hours consumed. The device consists of an electrolytic cell where current flow causes a measurable chemical change, such as the deposition of a metal or the release of a gas.
Electrolytic meters are primarily used for DC measurements due to the unidirectional nature of ion flow.
The chemical effect of current occurs exclusively in electrolytes where ions move toward oppositely charged electrodes.
These meters were historically used for energy billing before the advent of motor-type induction meters.
Simple construction without moving parts in basic designs
Independent of magnetic field interference
Integrates current over time naturally
Requires periodic electrolyte replacement
Not suitable for AC measurements (ions oscillate instead of migrating)
Slow response compared to electronic digital meters
Historical DC energy metering
Electroplating current monitoring
Battery charging capacity integration
Option B (DC Ammeter) usually operates on the Moving Coil (PMMC) principle, which uses the magnetic effect of current, not the chemical effect.
Option C (DC energy meter) is a broader term; however, specific chemical-based energy meters are classified as Ampere-hour meters.
A is correct — The DC Ampere-hour meter uses the chemical effect of current, governed by Faraday's laws, to integrate current over time via electrolytic deposition.
Always distinguish between the three effects of electric current: Heating (I2R), Magnetic (Electromagnetism/PMMC), and Chemical (Electrolysis). PMMC instruments use magnetic effects, while electrolytic cells use chemical effects.