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CBSE Class 10 Answered

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Asked by kirtichawla94 | 15 Jul, 2009, 06:42: PM
answered-by-expert Expert Answer

The current which changes its polarity after regular intervals of time is called alternating  current (AC).

The current which does change its polarity with time and always remains constant with time is direct current (DC).

Answered by | 16 Jul, 2009, 06:48: PM

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CBSE 10 - Physics
the resistance of a wire of 0.01 cm radius is 10 ohm.if the resistivity of the material of the wire is 50*10^-8 ohm meter find the length of the wire
Asked by prassanna.j | 03 Sep, 2023, 12:28: PM
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CBSE 10 - Physics
Nichrome wire of length L and radius R has resistance 10 ohm.How would the resistance of the wire change when: only diameter of the wire is doubled?Justify 
Asked by prassanna.j | 03 Sep, 2023, 12:21: PM
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CBSE 10 - Physics
The resistance of a resistor is kept constant and the potential difference across its two ends is decreased to half of its former value.State the change that will occur in the current through it.
Asked by prassanna.j | 03 Sep, 2023, 12:13: PM
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CBSE 10 - Physics
A given length of a wire is doubled of itself and this process is repeated once again.By what factor does the resistance of the wire changes?
Asked by prassanna.j | 03 Sep, 2023, 12:11: PM
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CBSE 10 - Physics
 A 6 ohm resistance is doubled by folding,what is the new resistance?
Asked by prassanna.j | 28 Aug, 2023, 09:49: PM
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CBSE 10 - Physics
Pls answer fast... In a resistive circuit, if the current is increased to two times the percentage change in the amount of heat dissipated in the circuit would be a) 400% b) 300% c) 200% d) 100%
Asked by anubhutiupadhaya | 04 Mar, 2023, 03:16: PM
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CBSE 10 - Physics
Equivalent resistance 
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Asked by praveenkumae975 | 06 Feb, 2023, 07:19: PM
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CBSE 10 - Physics
Two wires of copper have the same length but cross-sectional area in the ratio of 3:1. The resistance of the thicker wire is 12 ohm. (a) Calculate the resistance of the thinner wire. (b) Find the equivalent resistance of both these wires, when they are connected (1) in series (ii) parallel (c) If both the wires are connected in parallel to a battery of 24 volt, then find out the ratio of heat produced in the thicker wire to the thinner wire identify the wire if both of them are connected to the same source for the same time duration.
Asked by swetalinasamantaray022 | 20 Jan, 2023, 10:54: AM
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CBSE 10 - Physics
When a glass rod is rubbed with a piece of silk it acquires +10 micro coulomb of charge. How many electrons have been transferred from glass to silk?
Asked by rcgm729 | 02 Jan, 2023, 10:17: PM
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CBSE 10 - Physics
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Asked by ruparus | 04 Nov, 2022, 09:52: PM
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