A 19.0 ohm, 9.00 ohm , and 8.00 ohm resistor are connected in parallel to an emf source. A current of 9.00 A is in the 9.00 resistor.

Find the Potential difference across the source.

How do i solve this?

V=9a*9ohm=81 volts.

this is the same voltage across the other two resistors.

To solve this problem, you can use Ohm's Law, which states that the potential difference (V) across a resistor is equal to the current (I) passing through it multiplied by its resistance (R). In a parallel circuit, the potential difference across the source is the same as the potential difference across each of the resistors.

First, we need to find the potential difference across the 9.00 ohm resistor. Using Ohm's Law, V = I * R, where I = 9.00 A and R = 9.00 ohm.
So, the potential difference across the 9.00 ohm resistor is V = 9.00 A * 9.00 ohm = 81.0 V.

Since the potential difference is the same across all the resistors in parallel, the potential difference across the source is also 81.0 V.