Question

A torch bulb is rated 2.5V and 750mA. Calculate:

(a) it's power
(b)it's resistance and
(c)then energy consumed if this bulb is lighted for 4 hours.

Answer 1

C than energy consumed if thise bulb light

Answer 2

Voltage, V = 2.5 V
 Current, I = 750 mA = 0.75 A 

So, a) Power = V*I
                      = 2.5*0.75 = 1.875 W

      b) Resistance,R = V/I
                                  = 2.5/0.75 = 3.33 ohms
     
      c) E = p*t = 1.875*14400 = 27000 J