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1.	What is the current flow through R1, R2, and R3?
Answer» V = IR V = I(R1 + R2 + R3) I = V/(R1 + R2 + R3) = 9/(3 + 3 + 3) = 9/9 = 1 Amp.

Discussion

2.	If four 90 resistors are connected in series across an 18 V source, the current equals ___.
Answer» 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.

Discussion

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What is the current flow through R1, R2, and R3?

If four 90 resistors are connected in series across an 18 V source, the current equals ___.