The total circuit current, consisting of two parallel-connected 210 and 70 Ohm resistors, is 80mA.

The total circuit current, consisting of two parallel-connected 210 and 70 Ohm resistors, is 80mA. Find the currents of each resistor and the equivalent circuit resistance.

Initial data: R1 (resistance of the first resistor) = 210 Ohm; R2 (resistance of the second resistor) = 70 Ohm; I (total current in the circuit) = 80 mA (80 * 10-3 A); resistors are connected in parallel.

1) Determine the equivalent resistance of the entire circuit: R = R1 * R2 / (R1 + R2) = 210 * 70 / (210 + 70) = 52.5 Ohm.

2) Voltage in the circuit: U = I * R = 80 * 10-3 * 52.5 = 4.2 V.

3) Current in the first resistor: I1 = U / R1 = 4.2 / 210 = 0.02 A.

4) Current in the second resistor: I2 = U / R2 = 4.2 / 70 = 0.06 A.