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प्रश्न
Define an electric current.
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उत्तर १
An electric current is measured by the amount of electric charge moving per unit time at any point in the circuit.
उत्तर २
The magnitude of an electric current is the number of electric charges flowing through a conductor in one second.
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संबंधित प्रश्न
Define the unit of current.
In which direction do electrons flow?
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.
In the circuit shown below, the voltmeter reads 10 V.
(a) What is the combined resistance?
(b) What current flows?
(c) What is the p.d. across 2 Ω resistor?
(d) What is the p.d. across 3 Ω resistor?
Christmas tree lamps are usually wired in series. What happens if one lamps breaks?
Tick(✓) the correct choice in the following:
A three pin plug is connected to the lead for a 1 kW electric iron to be
used on a 250 V supply. Which of the following statements is not correct?
In the circuit shown in fig., find the reading of the ammeter A when the switch S is opened.
What is the purpose of a fuse in an electrical circuit?
If the potential differences between two parts of a thundercloud is 10s V,
what is the amount of energy given up during the passage of 20 coulombs?
(a)2x10-7J
(b)200J
(c)Sx106 j
(d)2x 109J
(e)2x 1010 J
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.
Fig . shows the core of a transformer and i ts input and output connections
State the material used for the core and describe th e structure of the core.
(a) Use the values given in the diagram to calculate the turns ratio for the transformer and connections, labeling all parts of the diagram .
(b) If a current of 2 A is taken from th e output, calculate th e current in the input circuit (Assume the transformer to be ideal ).
An electric iron is rated 750 W, 230 V. Calculate the electrical energy consumed by the press in 16 hours.
Fill in the blank :
1 mA = ............................. A.
What is the speed of electric current?
Problems for practice:
If 5A current flows through a circuit, then convert the current in terms of microampere?
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
Define the following:
Conventional current
Conventional current is defined as the direction in which which type of charge would flow?
In ionised gases (plasma), the charge carriers are:
In a vacuum, the particles that can act as charge carriers are:
Which of the following is the example expression for Alternating Current?
In the process of current flow through a conductor, the amount of charge passing per unit time gives:
