What maximum power can be generated from an 18-V emf using any combination of a 6.0-Ohm resistor and a 9.0-Ohm resistor?

90 W

Explanation:

The power generated from a power supply in a circuit with a total resistance R is

(1)

where

V is the emf of the source

R is the total resistance of the circuit

Here we have:

V = 18 V (emf of the power source)

We have two resistors of

From eq.(1), we see that the maximum power is generated when the total resistance is minimum: therefore, when the two resistors are connected in parallel.

In that case, the total resistance is given by:

So, the maximum power is:

this doesnt make any sense imao