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Longer line in the symbol for a cell represents its ___________terminal

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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 ____________.

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

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

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(a) positive

(b) battery

(c) becomes red hot and emits heat

(d) fuse.

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