- A car battery is a physical reserve of energy within the car system. The battery is usually charged by an alternator — a device that converts the mechanical energy from the engine into electrical energy.
2. How does it work?
- A car battery works by producing an electrical charge via a chemical reaction inside the battery, which is then sent through wires to power the starter, the lights, radio, and any other electrical components.
3. Components of a battery.
- Car batteries provide a nominal 12-volt potential difference by connecting six galvanic cells in series. Each cell provides 2.1 volts for a total of 12.6 volt at full charge.
4. How do you test a battery?
- Attach a voltmeter to the battery to measure the voltage. To do this you attach the positive lead of the voltmeter to the positive terminal of the battery and the negative lead the negative terminal of the battery. The voltage should be around 12.5 - 12.8 volts, this means that it is 100% charged.
5. What do you test before changing the battery?
- You check to see if the battery is fully charged and the terminals are clean/ are not loose.
- Check for current draw while the car is off.
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