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Question

# The dynamic plate resistance of a triode value is 10 kΩ. Find the change in the plate current if the plate voltage is changed from 200 V to 220 V.

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Solution

## Given: Plate resistance, ${r}_{\mathrm{p}}\mathit{}=10\mathrm{K\Omega }={10}^{4}\mathrm{\Omega }$ Change in plate voltage, $\delta {V}_{\mathrm{p}}=220-200=20\mathrm{V}$ Plate resistance at constant grid voltage is given as: ${r}_{\mathrm{P}}=\left(\frac{\delta {V}_{\mathrm{P}}}{\delta {I}_{\mathrm{P}}}{\right)}_{{V}_{\mathrm{G}}=C\mathrm{onstant}}\phantom{\rule{0ex}{0ex}}⇒\delta {I}_{\mathrm{P}}=\frac{\delta {V}_{\mathrm{P}}}{{r}_{\mathrm{P}}}\phantom{\rule{0ex}{0ex}}\delta {I}_{\mathrm{P}}=\frac{\delta {V}_{\mathrm{p}}}{{r}_{\mathrm{P}}}\phantom{\rule{0ex}{0ex}}\delta {I}_{\mathrm{P}}=\frac{20}{{10}^{4}}=0.002\mathrm{A}=2\mathrm{mA}\phantom{\rule{0ex}{0ex}}$

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