Question

Current of 3 milliamperes is drawn for a minute from a dry cell related 2 volts the energy delivered is about ?

a)0.1
b)0.2
c)0.4
d) none of these​

Answer 1

i = 3 mA => 3 × 10^ -3

T = 1 MIN => 60 sec.

v (p.d)= 2 v

we know,

e= w × t

e = vq( use formulas)

e = vit

= 2 × 10^ -3 × 60

= 120 × 10 ^ -3

= 12 × 10^ -2 j

= 0.12 j