A torch bulb is rated 2.5V and 750mA. Calculate:
a) it's power
b) it's resistance
c) then energy consumed if this bulb is lighted for 4 hours

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Solution

V = 2.5 V

I = 750 mA = 0.75 A

t = 4 hours = 43600 s = 14400 s

(a)P = VI

= 2.50.75

= 1.875 W

(b)R = V/I

= 2.5/0.75

= 3.33 Ω

(c)H = Pt

= 1.875*14400

= 27000 J or 27 kJ

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A torch bulb is rated 2.5V and 750mA. Calculate: a) it's power b) it's resistance c) then energy consumed if this bulb is lighted for 4 hours

V = 2.5 V I = 750 mA = 0.75 A t = 4 hours = 4*3600 s = 14400 s (a)P = VI = 2.5*0.75 = 1.875 W (b)R = V/I = 2.5/0.75 = 3.33 Ω (c)H = Pt = 1.875*14400 = 27000 J or 27 kJ

A torch bulb is rated 2.5V and 750mA. Calculate:
a) it's power
b) it's resistance
c) then energy consumed if this bulb is lighted for 4 hours

V = 2.5 V

I = 750 mA = 0.75 A

t = 4 hours = 43600 s = 14400 s

(a)P = VI

= 2.50.75

= 1.875 W

(b)R = V/I

= 2.5/0.75

= 3.33 Ω

(c)H = Pt

= 1.875*14400

= 27000 J or 27 kJ