In the circuit diagram given below, three resistors, R1, R2 and R3 of 5 Ω, 10 Ω and 30 Ω respectively are connected as shown.
Calculate :
(a) current through each resistor.
(b) total current in the circuit.
(c) total resistance in the circuit.
(a) Let I1, I2 and I3 be the current flowing through the resistors of 5 ohm, 100 ohm and 30 ohm, respectively.
According to ohm's law V=IR
Here V= 12 V and R = 5 ohm
I = V/R
Current through R1 = V/R1 = 12/5 = 2.4 A
Current through R2 = V/R2 = 12/10 = 1.2 A
Current through R3 = V/R2 = 12/30 = 0.4 A
(b) Total current in the circuit =Current through R1 +Current through R2 +Current through R3
= 2.4 + 1.2 + 0.4 = 4 A
(c) Total resistance in the circuit = R
R= 3 ohm