First slide

Thermal effect of current

Question

In a discharge tube when 200 V potential difference is applied 6.25 x 10¹⁸ electrons move from cathode to anode and 3.125 x 10¹⁸ singly charged positive ions move from anode to cathode in one second. Then the power of, tube (in W) is ________.

Moderate

Solution

$\begin{matrix} We use P = V i = V \frac{q}{t} = \frac{200 (6.25 \times 10^{18} + 3.125 \times 10^{18}) \times 1.6 \times 10^{- 19}}{1} \\ = 300 watt \end{matrix}$

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