17-Current Electricity

Current Electricity

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Biragam Singh
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53
Biragam Singh
Biragam Singh
Biragam Singh
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Eq. Resistance
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81
solution.livedoubt
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What happens to current and resistance if the length and cross-sectional area of a wire are both doubled ?
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RJVLKHN
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Why does the current not flow instantly in a circuit when the switch is closed ?
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5
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108
Amodini
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A copper wire of length 2 m and cross-sectional area has a resistance of . Calculate the resistivity of copper ?
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5
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99
Amodini
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The potential difference across a resistor is and current through it is . If the temperature increases such that the resistance increases by 20%, ..?
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5
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68
Amodini
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Explain why in parallel combination of resistors, the potential difference across each resistor remains the same ?
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346
Amodini
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Derive the condition for maximum power transfer from a cell to an external load ?
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68
Amodini
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Why is the internal resistance of a cell not negligible, and how does it affect terminal voltage ?
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109
Amodini
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Two wires made of different materials have the same resistance at room temperature. Will they have the same resistance at higher temperature? Explain.
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60
Amodini
Amodini
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Why is the potential difference across a superconductor zero even when a current is flowing ?
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117
Amodini
Amodini
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Derive the relation between drift velocity and electric current ?
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800
Amodini
Amodini
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Explain how drift velocity of electrons in a conductor changes with temperature, and why ?
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245
Amodini
Amodini
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Wire of resistance 5 Ω is connected to a 10 V battery ...?
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210
RJVLKHN
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Explain wheatstone Bridge Concept ?
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155
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Potentiometer wire of length 1 m has a resistance of 10 Ω and is connected to a 5 V battery in series with a 5 Ω resistor.?
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95
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A copper wire of cross-sectional area 1×10−6 m21×10−6 m2 carries a current of 3 A. Assuming number density .......?
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84
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Metallic wire has resistance 10 Ω at 0°C and 15 Ω at 100°C. Find the temperature coefficient of resistance ?
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104
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A cell of emf 1.5 V gives a current of 0.5 A when connected to a 2.5 Ω resistor....?
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5
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103
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Ritwick Banerjee
What is the effective resistance between A and B in the circuit shosen below?
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1
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214
Sneha Duhan
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