Advertisements
Advertisements
प्रश्न
If the charge on an electron is 1.6 × 10−19 coulombs, how many electrons should pass through a conductor in 1 second to constitute 1 ampere current?
Advertisements
उत्तर
Given:
Current,/=1A
Time,t=1s
Using the formula:
`I=Q/t`
or,
`Q=Ixxt `
=`1xx1`
=1=C
Now, if the charge is `1.6xx10^-19`C, the number of electrons is 1.So, if the charge is 1C, the number of electrons is given by:
`1/(1.6xx10^-19)xx1=6.25xx10^18`
Thus, `6.25xx10^18`electrons should pass though a conductor in 1 second to constitute 1 ampere current.
APPEARS IN
संबंधित प्रश्न
Choose the correct alternative and rewrite the following sentence.
When the resistance of a conductor increases, the current will ________ increase.
Draw the electrical symbols of the following components and state its use:
Rheostat (variable resistance)
Why should the resistance of:
a voltmeter be very large?
An electric circuit consisting of a 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each and a plug key was set up.
Following graph was plotted between V and I values:
What would be the values of `V/I` rations when the potential difference is 0.8 V, 1.2 V and 1.6 V respectively?
What conclusion do you draw from these values?
What is the resistance of the wire?
Ten bulbs are connected in a series circuit to a power supply line. Ten identical bulbs are connected in a parallel circuit to an identical power supply line.
(b) In which circuit, if one bulbs be brighter?
An electrician has wired a house in such a way that if a lamp gets fused in one room of the house, all the lamps in other rooms of the house stop working. What is the defect in the wiring?
Consider the circuit given below when A, B and C are three identical light bulbs of constant resistance. 
(a) List the bulbs in order of increasing brightness.
(b) If C burns out, what will be the brightness of A now compared with before?
(c) If B burns out instead, what will be the brightness of A and C compared with before?
Which effect of current is utilised in the working of an electric fuse?
Name two devices which work on the heating effect of electric current.
A strong short bar magnet is dropped into a solenoid connected to a
galvanometer as shown in fig. The galvanometer shows a deflection to the left when the current in the coil as seen from above is counter clockwise. Which one of the following shows the correct deflection of the galvanometer when the magnet is at posi tions A, Band C.
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V. Calculate:
(i) The resistance of the wire, and
(ii) The heat energy produced in 1 minute.
A battery of e.m.f. 15 V and internal resistance 2 Ω is connected to two resistors of resistances 4 ohm and 6 ohm joined (a) in series. Find in each case the electrical energy spent per minute in 6 Ω resistor.
Two electric bulbs rated 100 W; 220 V and 60 W; 220 V are connected in parallel to electric mains of 220 V. Find the current drawn by the bulbs from the mains.
The SI unit for electric current is the coulomb.
1020 electrons, each having a charge of 1.6 x 10-19 C, flows in a circuit V is 0.1s. What is the current in ampere?
