1. Batteries and DC Power Supplies
EGR 101

2. Batteries
EGR 101

3. Example: If a battery has 1 Ah rating, then,
Battery Capacity – a measure of how long the battery will last at a given output current, measured in ampere-hours (Ah)
Example: If a battery has 1 Ah rating, then,
-1 A discharge rate: battery will last 1 hour -100 mA discharge rate: battery will last 10 hours - 4 A discharge rate: battery will last 15 minutes
EGR 101

4. Series – Connected Batteries
EGR 101

5. Parallel – Connected Batteries
EGR 101

6. Types of Batteries (Primary Cells) – cannot be recharged
Carbon-zinc
Alkaline
Silver-oxide
Zinc-air
Lithium
Common Batteries
(Secondary Cell) – can be recharged
Lead-acid
Nickel-Cadmium (Ni-Cd)
Nickel Metal Hydride and Lithium Ion – newer replacements for Ni-Cds
EGR 101

7. DC Power Supplies DC Power Supply
a piece of equipment with dc outputs that can be adjusted to provide any voltage within its supply limits
EGR 101

8. DC Output Voltages
EGR 101