# An 18 Ω, 9 Ω, and 6 Ω resistor are connected in parallel to an emf source. A current of 4 A is the 9 Ω resistor. How do you calculate the resistance of the circuit? What is the potential difference across the source?

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How do you calculate the current in each resistor?

How do you calculate the current in each resistor?

##### 1 Answer

Mar 1, 2017

Since they are parallel, the voltage is the same for all resistors.

#### Explanation:

**Second question:**

**First question:**

You could use

**Or:**

You can calculate the currents through the other resistors, add them all up and recalculate the total resistance (voltage already calculated):

Now