Water boils in an electric kettle in 15 ...

Water boils in an electric kettle in 15 minutes after switching on. If the length of the heating wire is decreased to `2//3` of its initial value, then the same amount of water will with the supply voltage in

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(a) Water boils in an electric kettle in 15 minutes after being swiched on. Using the same mains supply, should the length of the heating element be increased or decreased if the water is to boiled in 10 minutes ? Why ? Does Ohm's law hold good under all conditions ?

Water boils in an electric kettle in 15 min after being switched on . Using the same main supply , should the length of the heating element be increased or decreased if the water is to be boiled in 10 min ? Why ?

The rating of a heating element is 220 V-1,000 W. if the heating elements is stretched to double of its initial length then what will be the power rating for the same voltage ?

A heater boils certain amount of water in 15 minutes. Another heater boils same amount of water in 10 minutes. Time taken to boil same amount of water when both are used in parallel is

A heater boils certain amount of water in 15 minute . Another heater boils same amount of water in 10 minutes . Time takes to boil same amount of water when both are used in parallel is .

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For a certain first order reaction, the concentration of the reactant decreases to nine-tenth of its initial value in ten minutes. Concentration of the reactant after 30 minutes from start will be :

In an electric kettle, water boils in 10 minutes after the kettle is switched on. With the same supply voltage if the water is to be boiled in 8 minutes, should the length of the heating elemnet be increased or decreased ? Explain .

There are two separate coils in a heater . If one col is used then it takes 20 minutes to boil a given amount of water completely. But when its other coil is used then it takes 5 minutes to boil the same amount of water. Calculate the time taken to boil the same amount of water using the same source when the two coils are connected (1) in series and (2) in parallel.

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