Q23 of 330 Page 11

If the charge on an electron is 1.6 x I0-19 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1-ampere current?

We know that charge over 1 electron = 1.6 × 10-19 coulomb

Thus, 1.6 × 10-19 C of charge = 1 electron

Therefore, 1 C of charge

More from this chapter

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21

Draw circuit symbols for (a) fixed resistance (b) variable resistance (c) a cell (d) a battery of three cells(e) an open switch (j) a closed switch.

 22

What is a circuit diagram? Draw the labelled diagram of an electric circuit comprising of a cell, a resistor, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance: an ammeter or a voltmeter?

 24

The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:

(a) a charge of 1 C passes through it?


(b) a charge of 5 C passes through it?


(c) a current of 2 A flows through it for 10 s?

 25

In 10 s, a charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit as a result.

(a) What is the p.d. across the battery?


(b) What current flows from the battery?