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CBSE Notes 2011-2012 » X-Science-Part1

Electricity

In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respecti...

Multiple choice question

In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness ?

An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse of what rating mus...

Multiple choice question

An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse of what rating must be used for it ?

Two resistors of resistance 2 Q and 4 Q when connected to a battery will have

Multiple choice question

Two resistors of resistance 2 Q and 4 Q when connected to a battery will have

Unit of electric power may also be expressed as

Multiple choice question

Unit of electric power may also be expressed as

A cylindrical conductor of length I and uniform area of cross-section A has resistance R. Another co...

Multiple choice question

A cylindrical conductor of length I and uniform area of cross-section A has resistance R. Another conductor of length 21 and resistance R of the same material has area of cross-section

If the current I through a resistor is increased by 100 % (assume that temperature remains unchanged...

Multiple choice question

If the current I through a resistor is increased by 100 % (assume that temperature remains unchanged), the increase in power dissipated will be

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