Question

In a vacuum diode, $2\times {10}^{19}$ electrons emitted from the cathode reach the plate of a vacuum diode in 4 seconds. Find the current and the power consumed if the potential difference between the cathode and the plate is $200V$.

• A. $0.8A,160W$
• B. $0.8A,16W$
• C. $0.8A,1.6W$
• D. $0.8A,1600W$

Answer 1

The correct option is A $0.8A,160W$

$I=\frac{q}{t}$

$=\frac{2\times {10}^{19}\times 1.6\times {10}^{-19}}{4}$

$=0.8A$

$Power=VI$

$=200\times 0.8=160W$