When current is switched 'on' in a room heater, it changes to _________(red, white) color.

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Solution

Answer- Red
Explanation:
$(i)$ The heating element in the room heater is of a metal like nichrome and the metals like nichrome have a high resistivity and a high melting point.
$(i i)$ Now the heating effect of the electric current will be applied and will produce heat when we start the current to flow.
$(i i i)$ This generated heat will make the heating coil glow brighter and brighter and finally it will glow in red colour.

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Question 8 (c)
When current is switched ‘on’ in a room heater, it ___.

Fill in the blanks:

(a) Longer line in the symbol for a cell represents its_________terminal.

(b) The combination of two or more cells is called a _________.

(d) The safety device based on the heating effect of electric current is called a _________.

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