*Question T5C09:
How much power is delivered by a voltage of 13.8 volts DC and a current of 10 amperes?*  

*Correct Answer is  A: 138 watts*  

### AI Response: (may contain errors)  

To calculate the power delivered by a voltage and current, we use the formula:

$$
P = V \times I
$$

where:
- $P$ = power in watts
- $V$ = voltage in volts
- $I$ = current in amperes

In this case, we have:
- $V = 13.8$ volts
- $I = 10$ amperes

Now, substituting the values into the formula:

$$
P = 13.8 \, \text{volts} \times 10 \, \text{amperes} = 138 \, \text{watts}
$$

### Explanation of the Correct Answer:
- The correct answer is **138 watts** because we applied the power formula correctly using the given voltage and current values.

### Explanation of Incorrect Choices:
- **Choice A: 0.7 watts**  
  This value is too low and does not result from the multiplication of the given voltage and current.
  
- **Choice B: 23.8 watts**  
  This value is also incorrect; it does not match the calculation from the provided voltage and current.
  
- **Choice C: 3.8 watts**  
  This is significantly lower than the calculated power and does not reflect the correct application of the power formula.

### Summary:
- The formula $P = V \times I$ is essential for calculating electrical power.
- Always ensure to multiply the correct voltage and current values to find the accurate power output.