*Question T5D10:
What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?*  

*Correct Answer is  A: 1 volt*  

### AI Response: (may contain errors)  

To find the voltage across a resistor, we can use Ohm's Law, which states:

$$V = I \times R$$

where:
- $V$ = voltage in volts
- $I$ = current in amperes
- $R$ = resistance in ohms

In this case, we have:
- $I = 0.5$ A (current)
- $R = 2$ ohms (resistance)

Now, substituting the values into the formula:

$$V = 0.5 \, \text{A} \times 2 \, \Omega = 1 \, \text{V}$$

This shows that the voltage across the 2-ohm resistor is 1 volt, which is the correct answer (Choice A).

### Explanation of Other Choices:
- **Choice B: 0.25 volts**
  - This would imply a calculation of $0.5 \, \text{A} \times 0.5 \, \Omega$, which is incorrect. The resistance is 2 ohms, not 0.5 ohms.

- **Choice C: 2.5 volts**
  - This would suggest a calculation of $0.5 \, \text{A} \times 5 \, \Omega$, which is also incorrect. The resistance is 2 ohms, not 5 ohms.

- **Choice D: 1.5 volts**
  - This would imply a calculation of $0.75 \, \text{A} \times 2 \, \Omega$, which is incorrect. The current is 0.5 A, not 0.75 A.

### Summary:
- The correct answer is 1 volt because it directly follows from Ohm's Law using the given current and resistance.
- The other choices are incorrect due to miscalculations or incorrect assumptions about the values of current or resistance.