By Ohm's law, V = IR.
I = V/R
Given, Four 90 ohm resisters in series.
So, R = ( R1 + R2 + R3 + R4) = 4 x 90 = 360 ohms.
Therefore, I = 18/360 = 0.05 A [or] 50 milli amps.
5. If a 220 Ω, a 100 Ω, and a 180 Ω resistor are connected in series across a 12 V source, the circuit current equals ___.
