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प्रश्न
What actually travels through the wires when you switch on a light?
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उत्तर
When we switch on a light, electrons travel through the wires. The flow of these electrons is called electric current.
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संबंधित प्रश्न
One coulomb charge is equivalent to the charge contained in:
(a) 2.6 × 1019 electrons
(b) 6.2 × 1019 electrons
(c) 2.65 × 1018 electrons
(d) 6.25 × 1018 electrons
Write down the formula which relates electric charge, time and electric current
State the factors on which the strength of electric current flowing in a given conductor depends.
A battery and three lamps are connected as shown:
Which of the following statements about the currents at X, Y and Z is correct?
(a) The current at Z is greater than that at Y.
(b) The current at Y is greater than that at Z.
(c) The current at X equals the current at Y.
(d) The current at X equals the current at Z.
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.
(a) Which circuit would have the highest voltage across each bulb?
Answer the following question.
An electric lamp of resistance 20 Ω and a conductor of resistance 4 0 are connected to a 6 V battery as shown in the circuit. Calculate: 
(a) the total resistance of the circuit,
(b) the current through the circuit,
(c) the potential difference across the (i) electric lamp and (ii) conductor, and
(d) power of the lamp.
Which part of an electrical appliance is earthed?
An electrical gadget can give an electric shock to its user under certain circumstances. Mention any two of these circumstances.
______ is used to measure the electric current.
Define an electric current.
In current electricity, a positive charge refers to ______.
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 |
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.
What is the SI unit for the current?
