Question

Evaluation
Find current I in the circuit below.
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Answer 1

Answer:I = 0.01 A

Explanation: in the given circuit

Ra = R1*R2/R1+R2

Ra = 20000/300

Ra = 200/3

now

Req = R3 + R4 + Ra

Req = 100 + 400 + 200/3

Ra = 1700/3 ohm

now we know

V = IR

I = V/R

I = 18/1700

I = 0.01 A