30 Ohm

What is the equivalent resistance of this circuit?

three resistors are connected in parallel. The resistors have resistance of 10 ohm, 30 ohm and 40 ohm, and are connected to a 90 V battery. A ammeter measures the current of the circuit.

2.2 ohm
6.3 ohm
10 ohm
80 ohm

The voltage is not relevant. Looking at the numbers, I'd say 6.3. It has to be less than 10.

1/R = 1/10 + 1/30 + 1/40 = 0.1 + 0.033 + 0.025 = 0.158
R = 6.3

.

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