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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
Which particles constitute the electric current in a metallic conductor?
State the factors on which the strength of electric current flowing in a given conductor depends.
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.
(i) Draw a diagram of this electric circuit to study the relation between the potential difference maintained between the points 'X' and 'Y' and the electric current flowing through XY.
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.
Consider the circuit given below when A, B and C are three identical light bulbs of constant resistance. 
(a) List the bulbs in order of increasing brightness.
(b) If C burns out, what will be the brightness of A now compared with before?
(c) If B burns out instead, what will be the brightness of A and C compared with before?
Calculate the effective resistance between the points A and B in the network shown below in Figure 8.45
A wire of length 5 m has a resistance of 2.0 Ω calculate:
(a) the resistance of wire of length 1 m
(b) the equivalent resistance if two such wires each of length 2 m are joined in parallel.
(c) the resistance of 1 m length of wire of same material but of half diameter.
Draw a schematic diagram of an electric circuit consisting of a battery of two cells each of 1.5 V, 5 Ω, 10 Ω and 15 Ω resistors and a plug key, all connected in series.
Define the following:
Semiconductors
Tick (✓) the correct choice among the following :
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For current to flow, one needs art open circuit.
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In the process of current flow through a conductor, the amount of charge passing per unit time gives:
