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प्रश्न
What is the Flow of Charge Called?
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उत्तर
The flow of electric charge in a conductor is called electric current. If a charge of Qcoulombs flows through a conductor in time t seconds, the magnitude of electric current is given by, I = Q/t.
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संबंधित प्रश्न
1 A = _________ mA
- 102
- 103
- 10-3
- 10-6
The SI unit of charge is volt.
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What is the p.d. at the terminals of the battery?
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Find :
(i) total resistance of the circuit.
(ii) total current flowing in the circuit.
(iii) the potential difference across R1.
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(a) Draw a circuit diagram to represent this. Add an arrow to indicate the direction of conventional current flow in the circuit.
(b) What is the effective resistance of the two resistors?
(c) Calculate the current that flows from the battery?
(d) What is the p.d. across each resistor?
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A wire is passed through a piece of cardboard as shown in fig .. An electric current flows vertically down the wire and then flows back up. The two sections of the write are observed to repel each other.
(a) Wi th the aid of a diagram, describe how you would plot the magnetic field lines on the card .
(b) Sketch the magnetic field patterns around both the sections of the wire. Use your sketch to explain why the two sections repel each other.
(c) The repulsive force between the two sections is small. What changes could be made to increase it?
Answer the following question.
What is the function of a galvanometer in a circuit?
Study the following circuit and find out:
(i) Current in 12 Ω resistor.
(ii) The difference in the readings of A1 and A2, if any.
Three resistances, of which two are equal when connected in series have an effective resistance of 30 ohms. When the three resistances are connected in parallel, the effective resistances is 3 ohms. Find the values of the individual resistances.
The SI unit for electric current is the coulomb.
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
The number of electrons constituting a 1-coulomb charge is ______.
What does the direction of current convey?
