Question

pls help me i know the answer but i have no idea how it comes.

Answer 1

Explanation:

Equivalent Resistance of R1 and R2 in parallel

= R1 * R2 / R1 + R2

= 1800 / 90

= 20 Ohms

Ammeter measures current flowing through the circuit :

V = I * R

I = V / R

I = 9 / 20

I = 0.45 A