In a vacuum triode, what prevents the grid from acting as another anode?
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A triode vacuum tube has three electrodes, namely an anode, a cathode and a control grid in between of those.
Assuming that the filament is hot, current would readily flow from the cathode into the anode when no bias voltage is applied to the grid, like a diode valve.
But doesn't the grid also have the ability to capture electrons? Would there be a non-negligible current path between the cathode and the grid?
vacuum-tube
asked 3 hours ago
MarkMark
190110
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A triode vacuum tube has three electrodes, namely an anode, a cathode and a control grid in between of those.
Assuming that the filament is hot, current would readily flow from the cathode into the anode when no bias voltage is applied to the grid, like a diode valve.
But doesn't the grid also have the ability to capture electrons? Would there be a non-negligible current path between the cathode and the grid?
vacuum-tube
asked 3 hours ago
MarkMark
190110
$endgroup$
add a comment |
$begingroup$
A triode vacuum tube has three electrodes, namely an anode, a cathode and a control grid in between of those.
Assuming that the filament is hot, current would readily flow from the cathode into the anode when no bias voltage is applied to the grid, like a diode valve.
But doesn't the grid also have the ability to capture electrons? Would there be a non-negligible current path between the cathode and the grid?
vacuum-tube
asked 3 hours ago
MarkMark
190110
$endgroup$
A triode vacuum tube has three electrodes, namely an anode, a cathode and a control grid in between of those.
Assuming that the filament is hot, current would readily flow from the cathode into the anode when no bias voltage is applied to the grid, like a diode valve.
But doesn't the grid also have the ability to capture electrons? Would there be a non-negligible current path between the cathode and the grid?
vacuum-tube
vacuum-tube
asked 3 hours ago
MarkMark
190110
asked 3 hours ago
MarkMark
190110
asked 3 hours ago
MarkMark
190110
asked 3 hours ago
MarkMark
190110
asked 3 hours ago
MarkMark
190110
190110
add a comment |
add a comment |
2 Answers
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The grid is maintained at a negative voltage with respect to the cathode (similar to the operation of a N-channel JFET, or a depletion mode N-channel MOSFET), so electrons will be repelled by it. A result is that fewer electrons reach the anode, which has a positive voltage with respect to the cathode in order to attract electrons.
Whatever small current flows in the grid is considered leakage.
answered 2 hours ago
BartBart
552214
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$begingroup$
But doesn't the grid also have the ability to capture electrons?
You are correct, it does and some non-negligible current can flow.
However, to get a current the electrons need to actually enter the grid.
If we look at the construction of a triode:
we can see that the grid is just a thin wire, so the chance of an electron hitting (touching) it is small. Most electrons will "miss", travel between the grid's wires and reach the anode.
Depending on the voltages at grid and anode, the "pull" (due to the electric field) on the electrons from the anode might be stronger preventing the electrons from entering the grid.
answered 2 hours ago
BimpelrekkieBimpelrekkie
52.2k246117
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2 Answers
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active
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2 Answers
2
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The grid is maintained at a negative voltage with respect to the cathode (similar to the operation of a N-channel JFET, or a depletion mode N-channel MOSFET), so electrons will be repelled by it. A result is that fewer electrons reach the anode, which has a positive voltage with respect to the cathode in order to attract electrons.
Whatever small current flows in the grid is considered leakage.
answered 2 hours ago
BartBart
552214
$endgroup$
add a comment |
$begingroup$
The grid is maintained at a negative voltage with respect to the cathode (similar to the operation of a N-channel JFET, or a depletion mode N-channel MOSFET), so electrons will be repelled by it. A result is that fewer electrons reach the anode, which has a positive voltage with respect to the cathode in order to attract electrons.
Whatever small current flows in the grid is considered leakage.
answered 2 hours ago
BartBart
552214
$endgroup$
add a comment |
$begingroup$
The grid is maintained at a negative voltage with respect to the cathode (similar to the operation of a N-channel JFET, or a depletion mode N-channel MOSFET), so electrons will be repelled by it. A result is that fewer electrons reach the anode, which has a positive voltage with respect to the cathode in order to attract electrons.
Whatever small current flows in the grid is considered leakage.
answered 2 hours ago
BartBart
552214
$endgroup$
The grid is maintained at a negative voltage with respect to the cathode (similar to the operation of a N-channel JFET, or a depletion mode N-channel MOSFET), so electrons will be repelled by it. A result is that fewer electrons reach the anode, which has a positive voltage with respect to the cathode in order to attract electrons.
Whatever small current flows in the grid is considered leakage.
answered 2 hours ago
BartBart
552214
answered 2 hours ago
BartBart
552214
answered 2 hours ago
BartBart
552214
answered 2 hours ago
BartBart
552214
552214
add a comment |
add a comment |
$begingroup$
But doesn't the grid also have the ability to capture electrons?
You are correct, it does and some non-negligible current can flow.
However, to get a current the electrons need to actually enter the grid.
If we look at the construction of a triode:
we can see that the grid is just a thin wire, so the chance of an electron hitting (touching) it is small. Most electrons will "miss", travel between the grid's wires and reach the anode.
Depending on the voltages at grid and anode, the "pull" (due to the electric field) on the electrons from the anode might be stronger preventing the electrons from entering the grid.
answered 2 hours ago
BimpelrekkieBimpelrekkie
52.2k246117
$endgroup$
add a comment |
$begingroup$
But doesn't the grid also have the ability to capture electrons?
You are correct, it does and some non-negligible current can flow.
However, to get a current the electrons need to actually enter the grid.
If we look at the construction of a triode:
we can see that the grid is just a thin wire, so the chance of an electron hitting (touching) it is small. Most electrons will "miss", travel between the grid's wires and reach the anode.
Depending on the voltages at grid and anode, the "pull" (due to the electric field) on the electrons from the anode might be stronger preventing the electrons from entering the grid.
answered 2 hours ago
BimpelrekkieBimpelrekkie
52.2k246117
$endgroup$
add a comment |
$begingroup$
But doesn't the grid also have the ability to capture electrons?
You are correct, it does and some non-negligible current can flow.
However, to get a current the electrons need to actually enter the grid.
If we look at the construction of a triode:
we can see that the grid is just a thin wire, so the chance of an electron hitting (touching) it is small. Most electrons will "miss", travel between the grid's wires and reach the anode.
Depending on the voltages at grid and anode, the "pull" (due to the electric field) on the electrons from the anode might be stronger preventing the electrons from entering the grid.
answered 2 hours ago
BimpelrekkieBimpelrekkie
52.2k246117
$endgroup$
But doesn't the grid also have the ability to capture electrons?
You are correct, it does and some non-negligible current can flow.
However, to get a current the electrons need to actually enter the grid.
If we look at the construction of a triode:
we can see that the grid is just a thin wire, so the chance of an electron hitting (touching) it is small. Most electrons will "miss", travel between the grid's wires and reach the anode.
Depending on the voltages at grid and anode, the "pull" (due to the electric field) on the electrons from the anode might be stronger preventing the electrons from entering the grid.
answered 2 hours ago
BimpelrekkieBimpelrekkie
52.2k246117
answered 2 hours ago
BimpelrekkieBimpelrekkie
52.2k246117
answered 2 hours ago
BimpelrekkieBimpelrekkie
52.2k246117
answered 2 hours ago
BimpelrekkieBimpelrekkie
52.2k246117
52.2k246117
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add a comment |
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