The current in a triode at anode potential 10 | vedclass

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(A) Transconductance $(g_m)$ is defined as the ratio of the change in anode current $(\Delta I_p)$ to the change in grid potential $(\Delta V_g)$ at a

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$2$

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(A) Transconductance $(g_m)$ is defined as the ratio of the change in anode current $(\Delta I_p)$ to the change in grid potential $(\Delta V_g)$ at a constant anode potential $(V_p)$.$g_m = \left( \frac{\Delta I_p}{\Delta V_g} ight)_{V_p = 	ext{constant}}$Given:Initial current $I_1 = 7.5 \, mA$, Initial grid potential $V_{g1} = -1.2 \, V$Final current $I_2 = 5.5 \, mA$, Final grid potential $V_{g2} = -2.2 \, V$Change in current $\Delta I_p = I_1 - I_2 = 7.5 \, mA - 5.5 \, mA = 2.0 \, mA$Change in grid potential $\Delta V_g = V_{g1} - V_{g2} = -1.2 \, V - (-2.2 \, V) = 1.0 \, V$$g_m = \frac{2.0 \, mA}{1.0 \, V} = 2 \, mA/V = 2 \, m \, mho$.

The current in a triode at anode potential $100 \, V$ and grid potential $-1.2 \, V$ is $7.5 \, mA$. If the grid potential is changed to $-2.2 \, V$, the current becomes $5.5 \, mA$. The value of transconductance $(g_m)$ will be .... $mili \, mho$.

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