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
Calculate the number of electrons constituting one coulomb of charge.
The atoms of copper contain electrons and the atoms of rubber also contain electrons. Then why does copper conduct electricity but rubber does not conduct electricity?
In 10 s, charge of 25 C leaves a battery, and 200 J of energy are delivered to an outside circuit a result.
What is the p.d. across the battery?
A student made an electric circuit shown here to measure the current through two lamps.
Are the lamps in series or parallel?
(a) Are the lamps in series or parallel?
(b) The student has made a mistake in this circuit. What is the mistake?
(c) Draw a circuit diagram to show the correct way to connect the circuit. Use the proper circuit symbols in your diagram.
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.
(d) Which circuit would have less current in it?
How do you think the brightness of two lamps arranged in parallel compares with the brightness of two lamps arranged in series (both arrangements having one cell)?
Tick(✓) the correct choice in the following:
When the length of a conductor is doubled the resistance of the conductor
will
Two resistors P and Q of the same material and length but of different thickness are connected in parallel to a battery. The cross- sectional area of P is twice that of Q. What is the ratio of
(a) The resistance of P to the resistance of Q?
(b) The current in P to the current in Q?
Find the effective resistance in the following circuit diagrams (Fig.):
What is the criteria for selecting a fuse wire?
Tick (✓) the correct choice among the following :
In fig .XY is at right angles to the magnetic field. The direction in
which XY should be moved to induce an electron flow in the direction Y to X as indicated by the arrow is
What determines the direction of flow of electrons between two charged conductors kept in contact?
Coulomb is the SI unit of ____________.
Match the following:
| 1. | 1 mA | a. | series |
| 2. | 1 pA | b. | ohmmeter |
| 3. | Ammeter | c. | 10-6 ampere |
| 4. | Electrical resistivity | d. | 10-3 ampere |
What are the effects of electric current?
A current of 2A passing through the conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is ______.
Find the odd one out.
Loudspeaker, Bar magnet/magnet, Electric motor, Microphone.
