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+1 vote
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in Electricity Current by (47.4k points)
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(a) A torch bulb is rated 2.5 V and 750 mA. Calculate 

(i) its power, 

(ii) its resistance, 

(iii) the energy consumed if this bulb is lighted for 4 hours. 

(b) Two identical resistors, each of resistance 2 Ohm, are connected in torch 

(i) in series and 

(ii) in parallel, to a battery of 12 volts. Calculate the ratio of power consumed in two

1 Answer

+1 vote
by (47.6k points)
selected by
 
Best answer

(a)V = 2.5V

P = ?

Energy E = ?

I =750mA = 0.75A.

R=?

t = 4hours

(i)P=VI

∴ P = 2.5 x 0.75 = 1.875W

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