Batteries and DC Power Supplies
EGR 101
1
Batteries
EGR 101
2
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
3
Series – Connected Batteries
EGR 101
4
Parallel – Connected Batteries
EGR 101
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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
6
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
7
DC Output Voltages
EGR 101
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