How does an electric kettle work?
Important Questions on Electricity
(a) What material is used in making the filament of an electric bulb?
(b) Name the characteristics which make it suitable for this.
Observe the given diagram and answer the question that follows.
How is the temperature adjusted when we rotate the knob while using an electric iron on different fabrics?
Tungsten metal is used to make a solenoid type coil in an electric bulb.
Allow the current to pass for about minutes. Now remove the electrodes from the solution and look at them carefully. Do you find any difference in any one of them? Do you find a coating over it? What colour is the coating? Note down the terminal of the battery with which this electrode is connected. The process that you saw in the above activity, is used for purification of copper. A thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of the battery and why?
(b) What property of the filament wire accounts for this difference?
Observe the given diagram and answer the question that follows.
Which effect of electricity is used?
Observe the given diagram and answer the question that follows.
What will happen if the brass layer and iron layer is interchanged in their placement in the bimetallic strip?
