The phrase "a number of electrodes" is correct and usable in written English.
It can be used when referring to multiple electrodes in a scientific or technical context.
Example: "The experiment required a number of electrodes to measure the electrical activity in the brain."
Alternatives: "several electrodes" or "multiple electrodes".
But Holter monitors require a number of electrodes to be stuck to the body and connected, via a tangle of wires, to a bulky recording device worn at the hip.
In this type of surveys, a number of electrodes are planted on the ground surface maintaining an equal inter-electrode separation.
A number of electrodes which are catalysts for the chlorine evolution reaction have been investigated using steady state current-potential and impedance-potential measurements.
The oxygen evolution reaction has been investigated on a number of electrodes which are electrocatalysts for the chlorine evolution reaction, by making measurements in NaClO4 solution.
The local conductivity measured by a number of electrodes located at the periphery of the plane was then further converted into a local phase concentration distribution based on Maxwell's relation.
The goal of electrical impedance tomography (EIT) is to obtain the electrical impedance distribution in the domain of interest by injecting currents or applying voltages and measuring voltages or currents via a number of electrodes that are mounted nonintrusively but invasively on the boundary of the domain.
Microelectrode arrays offer the auditory systems physiologists many opportunities through a number of electrode technologies.
By combining a number of electrode configurations, complementary spatially distributed information on a large 3D cell culture can be obtained with maximised sensitivity in the entire 3D space.
The electrolyser stack offers multi-fold benefits for preparation of conducting polymer electrodes, i.e. low energy consumption, facile control of the electrode capacitance and simultaneous preparation of a number of identical electrodes.
The second configuration is the 'surface discharge' (SD) arrangement in which a plane dielectric with a number of surface electrodes on the dielectric layer and a counter electrode on its reverse side is used.
In EIS, a known current is injected into the surface and the voltage is measured at a number of points (electrodes) on the surface of the object.
