A 9V battery has two distinct terminals: a positive terminal and a negative terminal.
Understanding the polarity of a 9V battery is essential for correctly connecting it to electronic devices, such as smoke alarms. Based on information from First Alert support, the polarity of the terminals on a standard 9V battery is easily identifiable by their shape.
The reference clearly states:
- The round terminal (◯) is the positive (+) charge.
- The hexagonal terminal (⬢) is the negative (-) charge.
This distinction in shape helps users correctly orient the battery during installation. For instance, when replacing batteries in smoke alarms, knowing which terminal is positive or negative ensures proper electrical contact, as indicated in the guide.
Here's a simple breakdown based on the provided reference:
9V Battery Terminal Polarity
| Terminal Shape | Polarity |
|---|---|
| Round (◯) | Positive (+) |
| Hexagonal (⬢) | Negative (-) |
Knowing these shapes and their corresponding polarities is crucial for safe and effective use of 9V batteries in various applications.
