Question

a torch bulb is rated 5 v and 500 mA calculate its energy consumed when it is used for 2&1/2 hours​

Answer 1

Explanation:

given

v= 5

I = 500am

t= 2 h = 2x60min = 2x3600s

1/2h = 30min= 1800s

E= V x I x t

E= 5v x 500 x 3600

E= 9000000J

Now

E= 5v x 500 x 1800

E = 4500000