*Question G5B03:
How many watts of electrical power are consumed if 400 VDC is supplied to an 800-ohm load?*  

*Correct Answer is  B: 200 watts*  

### AI Response: (may contain errors)  

To determine the power consumed by a load, you can use the formula for electrical power:

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

where:
- $P$ is the power in watts,
- $V$ is the voltage in volts,
- $R$ is the resistance in ohms.

Given:
- $V = 400 \text{ VDC}$
- $R = 800 \text{ ohms}$

Substitute these values into the formula:

$$
P = \frac{400^2}{800} = \frac{160000}{800} = 200 \text{ watts}
$$

### Explanation of Choices:
- **A: 0.5 watts**  
  This is incorrect. It results from a misunderstanding of the formula or incorrect calculation.
  
- **B: 200 watts**  
  This is the correct answer, as calculated above using the power formula.

- **C: 400 watts**  
  This is incorrect. It might be chosen if one mistakenly doubled the correct answer without proper calculation.

- **D: 3200 watts**  
  This is incorrect. It could result from a miscalculation, such as multiplying instead of dividing by the resistance.

By using the formula $P = \frac{V^2}{R}$, you can accurately determine the power consumed by the load.