Water takes a long time to boil due to its specific heat. Wikipedia answers it with a lot of science (see link) http://en.wikipedia.org/wiki/Specific_heat_capacity
but I have a slightly easier way of explaining it.
So, we're dealing with two actual processes going on here.
1) First, you're raising the temperature of the water from whatever it starts at to 100 degrees C (212 degrees F). Specific heat is a scientific formula that tells you how much energy it takes to increase one litre of something by one degree celsius, and water takes a whole bunch of energy. Metal has a low specific heat, its really easy to warm it up. You can hold a teaspoon of water in one hand, and a penny in the other, and the penny will feel warmer quicker, but it also will cool quicker.
2) The second process is changing the phase of water, from a liquid to a gas. It takes a LOT of energy to change something form a solid to a liquid, or from a liquid to a gas.
Yes, we can boil water if we pass enough current through it......
You can't boil eggs in an electric fry pan. An electric fry pan needs to be plugged in and shouldn't be near water.
Cause aluminum easily transfers energy to air molecules.
the element makes the water boil
Yes
The main use for an electric range cooker is primarily to cook products for consumption. These cookers can be used to fry, boil and poach as well as bake.
It takes less time to boil little amounts of water because there is less water to boil. The more water in the pot, the longer it takes to heat up.
Water with salt will actually take longer than water without salt to evaporate. This is due to boiling point elevation. If you put a solute into water, it will make it more difficult to boil, and therefore will boil at a higher temperature. Since it takes longer for the salt water to boil, it will take longer for it to evaporate as well
The boiling point is increased after adding impurities to water.
impurities rise the boiling point
Salt changes the molecular composition of the water, causing its boiling point to go up. That's why it takes it longer to boil.
If you have a kettle, the more water you put in, the longer it takes.