Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
When potential difference = 0.8 V, current = 0.32 A.
`V/I=0.8/0.32`
`V/I = 2.5`
When potential difference = 1.2 V, current = 4.8 A.
`V/I= 12/48`
`V/I=2.5`
When/ /potential difference = 1.6 V, current = 6.4 A.
`V/I= 1.6/6.4 `
`V/I =2.5`h V-I graph is a straight line with a constant slope of 2.5.
The resistance of the wire is 2.5 Ω.
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
To increase the effective resistance in a circuit the resistors are connected in _____________.
The work done in moving a unit charge across two points in an electric circuit is a measure of ______.
In the circuit diagram given below five resistances of 10 Ω, 40 Ω, 30 Ω, 20 Ω, and 60 Ω are connected as shown to a 12 V battery.
Calculate:
(a) total resistance in the circuit.
(b) total current flowing in the circuit.
If the lamps are both the same in the figure given below and if A1 reads 0.50 A, what do A2, A3, A4 and A5 read?
Draw a circuit diagram to show how two 4 V electric lamps can be lit brightly from two 2 V cells.
If you were going to connect two light bulbs to one battery, would you use a series or a parallel arrangement? Why? Which arrangement takes more current from the battery?
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?
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.
Answer the following question.
What is the function of a galvanometer in a circuit?
Give the electric current unit.
- What is meant by electric current?
- Name and define its unit.
- Which instrument is used to measure the electric current? How should it be connected in a circuit?
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly
In ionised gases (plasma), the charge carriers are:
A charge of 20 C flows through a conductor in 4 s. The electric current through the conductor is:
