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A torch bulb is rated at 3 V and 600 mA. Calculate it’s (a) power (b) resistance (c) energy consumed if it is used for 4 hour.

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A torch bulb is rated at 3 V and 600 mA. Calculate it’s 

(a) power 

(b) resistance

 (c) energy consumed if it is used for 4 hour.

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1 Answer

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Best answer

Voltage V = 3 V 

Current I = 600 mA 

(a) Power = VI = 3 × 600 × 10-3 

= 1800 × 10-3 

= 1.8 W

(c) Time = 4h

Energy consumed E = P × t 

E = 1.8 × 4 

= 7.2 W

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