In the room wiring, 4 lamps are connected in parallel, each with a resistance of 330 ohms.

In the room wiring, 4 lamps are connected in parallel, each with a resistance of 330 ohms. The current in each lamp is 0.3 A. Determine the current flowing through the wiring and the resistance of the entire group of lamps.

1.The total current will be equal to the sum of the currents passing through each lamp.

I = I1 + I2 + I3 + I4;

I = 0.3 + 0.3 + 0.3 + 0.3;

I = 1.2 (A).

2. The total resistance of all lamps will be equal to:

1 / R = 1 / R1 + 1 / R2 + 1 / R3 + 1 / R4.

Since R1 = R2 = R3 = R4, then:

R = R1 / 4;

R = 330/4;

R = 82.5 (Ohm).

Answer: the total current will be 1.2 A; the total resistance of the circuit is 82.5 ohms.