*Question G5B12:
What is the RMS voltage across a 50-ohm dummy load dissipating 1200 watts?*  

*Correct Answer is  B: 245 volts*  

### AI Response: (may contain errors)  

To find the RMS voltage across a 50-ohm dummy load dissipating 1200 watts, we can use the formula for power in terms of voltage and resistance:

$$
P = \frac{V^2}{R}
$$

where:
- $P$ is the power in watts (1200 watts in this case),
- $V$ is the RMS voltage across the load,
- $R$ is the resistance in ohms (50 ohms here).

Rearranging the formula to solve for $V$, we get:

$$
V = \sqrt{P \times R}
$$

Substitute the given values into the formula:

$$
V = \sqrt{1200 \times 50}
$$

Calculate the result:

$$
V = \sqrt{60000} = 245 \text{ volts}
$$

Thus, the correct answer is 245 volts (Choice B).

**Why the other choices are incorrect:**

- **Choice A: 173 volts**  
  This value is too low. It might result from a miscalculation or using incorrect values for power or resistance.

- **Choice C: 346 volts**  
  This value is too high. It could result from a miscalculation, such as using a different resistance value.

- **Choice D: 692 volts**  
  This value is significantly too high and likely results from a misunderstanding of the formula or incorrect arithmetic.

By using the correct formula and substituting the given values, we confirm that the RMS voltage across the dummy load is 245 volts.