Current Electricity

Question 1

If there are n batteries and polarity of m batteries are reversed , then what is the formula of current I ?

Answer 1

I= (n-2m)E/nr+R

Question 2

Formula for power and hey entered across a resistor

Answer 2

P= V²/R= i²R= Vi
H= V²/R x t=i²Rt = Vit

Question 3

For conversion of galvanometer into ammeter , shunt resistance S=?

Answer 3

S= [i(g)/ i-i(g)]G

Question 4

For conversion of a galvanometer into voltmeter , V=? And R=?

Answer 4

V= i(g) (G+R)
R= V/i(g) - G

Question 5

EMF of battery E=?

Answer 5

E= W/q

Question 6

Power supplied/ consumed by battery = ?

Answer 6

P= +- Ei

Question 7

Internal resistance r of a battery in the experiment of potentiometer =?

Answer 7

r= R(E/V - 1)= R(l1/l2 -1)

Question 8

Comparison of EMFs of two batteries in the experiment of potentiometer E1/E2=?

Answer 8

E1/E2= l1/l2

Question 9

Equivalent potential V across 2 batteries in parallel =?

Answer 9

V= (E1/r1 + E2/r2)/(1/r1 + 1/r2 )