Question

A bulb with a resistance of 4 Ohms is plugged into a 2V battery. It has a capacity of 3 amps-hours. How long will this bulb remain at a constant brightness? Show all your working.

Answer 1

Bulb will remain at constant brightness for 6 hour

Step-by-step explanation:

We have given resistance of the bulb R = 4 ohm

Potential difference of the battery V = 2 volt

So current
`i=(V)/(R)=(2)/(4)=0.5A`

Capacity of the battery is given as 3 amp hour

We have to find the time by which bulb will remain at constant brightness

So time will be
`=(3)/(0.5)=6hour`

So bulb will remain at constant brightness for 6 hour