The ohm second is equal to

Options

A. weber
B. tesla
C. henry
D. watt

Explanation

To determine what the unit "ohm second" is equal to, we can analyze the relationship between ohms, seconds, and inductance.

### Step-by-Step Solution:

1. **Understanding the Units**:
- The unit "ohm" (Ω) is the unit of electrical resistance.
- The unit "second" (s) is the unit of time.

2. **Relating Ohm and Inductance**:
- Inductance (L) is measured in henries (H).
- The inductive reactance (X_L) is given by the formula:
\[ X_L = \omega L \]
where \( \omega \) is the angular frequency in radians per second (s⁻¹).

3. **Rearranging the Formula**:
- From the formula, we can express inductance (L) as:
\[ L = \frac{X_L}{\omega} \]

4. **Substituting Units**:
- The unit of inductive reactance \( X_L \) is ohms (Ω).
- The unit of angular frequency \( \omega \) is seconds inverse (s⁻¹).
- Therefore, substituting the units gives:
\[ L = \frac{\text{ohm}}{\text{second}^{-1}} = \text{ohm} \cdot \text{second} = \text{ohm second} \]

5. **Identifying the Equivalent Unit**:
- We know that the unit of inductance (L) is henries (H).
- Thus, we can conclude that:
\[ \text{ohm second} = \text{henry} \]

6. **Final Answer**:
- Therefore, the ohm second is equal to henry (H).