Example 1 A hair dryer draws a current of 3 A. If it is switched on for 5 minutes, (a) how much charge, and (b) how many electrons have passed through it?
Example 1 A hair dryer draws a current of 3 A. If it is switched on for 5 minutes, (a) how much charge, and (b) how many electrons have passed through it?
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Transcribed Image Text:3:46 PM O t į v
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Chapter 2 sprin 2021.p..
i. =- i 2
i2
Example 1
A hair dryer draws a current of 3 A. If it is switched on for 5
minutes,
(a) how much charge, and
(b) how many electrons have passed through it?
• Solution:
(a) By I = Q/t
3 = Q/ (5 x 60)
Q = 900 C
(b) charge of 1 electron = 1.6 x 10-19 C
no. of electron = 900 / (1.6 x 10-19) = 5.625 x 1O21
Example
Determine the total charge entering a terminal between t = 1s and
t = 2 s if the current passing the terminal is i = (3t2 – t) A.
Solution:
0 =
i dt =
(312 - t)dt
- (^ -)
= (8 – 2) -
= 5.5 C
The current flowing through a wire is given by Figure. Determine the net
charge moving through the wire if q(0) = 0.
Solution :
The net charge moving through the wire is
i(t) A
2 A
2t C
0<t<2
2t +8C
g(t) =
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