When current is switched ON in a room heater, the _________ .

A hammer, a gong, and a soft iron strip are all parts of __________________

In parallel combination of the cells positive terminal of one cell is connected to the ___________ terminal of the other cell.

The element used almost exclusively for filaments of incandescent lamps is __________________.

Which of these is an example of an electric cell? 

In the following arrangement shown in Fig. the bulb will not glow if the ends A and B are connected with

Lead acid accumulator is an example of ______________ cell.

In a dry cell ammonium chloride is separated from the manganese dioxide with the help of ___________________ .

LEDs are extensively used to replace bulbs because _________________.

Three dry cells are connected as shown in the figure.If e.m.f of each cell is 2 V, then the total e.m.f of the combination is __________V.