A TV set picture tube shoots out a beam of electrons. The current due to this beam is 10 mA. How many electrons will strike the TV screen every second?

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Solution

Answer:

Given values:

Current, I = 10 mA = 0.01 A;
Time, T = 1 sec;
Charge, Q = ?

As per the formula:

Charge = Current x Time
Q = 0.01 x 1
Q = 0.01 C

Now,

Apply,
Q = n x e
n x 1.6 x 10^-19 = 0.01
n = 0.01/1.6 x 10^-19
n = 0.00625 x 10¹⁹
No of electrons are 6.25 x 10¹⁶

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A TV set picture tube shoots out a beam of electrons. The current due to this beam is 10 mA. How many electrons will strike the TV screen every second?

Answer: Given values: Current, I = 10 mA = 0.01 A; Time, T = 1 sec; Charge, Q = ? As per the formula: Charge = Current x Time Q = 0.01 x 1 Q = 0.01 C Now, Apply, Q = n x e n x 1.6 x 10-19 = 0.01 n = 0.01/1.6 x 10-19 n = 0.00625 x 1019 No of electrons are 6.25 x 1016

Answer:

Given values:

Current, I = 10 mA = 0.01 A;
Time, T = 1 sec;
Charge, Q = ?

As per the formula:

Charge = Current x Time
Q = 0.01 x 1
Q = 0.01 C

Now,

Apply,
Q = n x e
n x 1.6 x 10^-19 = 0.01
n = 0.01/1.6 x 10^-19
n = 0.00625 x 10¹⁹
No of electrons are 6.25 x 10¹⁶