How many electrodes are in the tetrode?

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(C) tetrode is a vacuum tube (thermionic valve) that contains four electrodes. These electrodes are: $1$. The cathode (which emits electrons). $2$. Th

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$4$

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(C) tetrode is a vacuum tube (thermionic valve) that contains four electrodes. These electrodes are: $1$. The cathode (which emits electrons). $2$. The control grid (which controls the flow of electrons). $3$. The screen grid (which reduces the capacitance between the control grid and the anode). $4$. The anode or plate (which collects the electrons). Therefore,the total number of electrodes is $4$.

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