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Why in conductors charge is transferred by free electrons rather than by positive charge?

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A light bulb is switched on for 40s. If the electrical energy consumed by the bulb during this time is 2400 J,

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Connect a battery to a small 2.5V light bulb and observe the brightness of the bulb.

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A bird can sit harmlessly on high tension wire- But it must not reach and grab neighbouring wire. Do you know why?

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Which metal is used as the filament of an electric bulb? Explain with reason.

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How long does it take a current of 10 mA to deliver 30 C of charge?

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Describe some safety measures that should be in connection with the household circuit.

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How does short circuit occur and how can it be avoided?< .

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Describe briefly the hazards of household electricity.

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Why is the voltage used for domestic supply much lower than the voltage at which the power is transmitted?

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The voltage chosen for the transmission of electrical power over large distances ,

asked Oct 23, 2017 in Physics by shamroz (41.5k points)

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Define the term time period and frequency.

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What is difference between d.c. and a.c.?

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How can the cost of electricity consumed in a house be calculated?

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What is kilowatt-hour? How energy in kilowatt-hour can be obtained?

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What do you mean by electric power? Define its unit

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How is energy dissipated in a resistance? Explain.

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State and explain Joule's law. ,

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What are the advantages of parallel circuits over series circuits?

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Describe the characteristic features of parallel combination of resistors.

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