3.5 DC sources of electricity Flashcards
(27 cards)
can primary cells be recharged
no
what are nearly all primary cells
dry cells
what is the voltage of a zinc-carbon dry
1.5V
what is a disadvantage of a zinc-carbon battery
over time they begin leak
can some alkaline batteries be recharged
yes
in aircraft storage batteries, what are secondary cells made from
lead acid or nickel cadmium
what is a group of secondary cells connected together called
battery of cells
what is the voltage of a nickel cadmium battery
1.2v
what is the voltage of a lead acid battery
2.2v
what is the liquid electrolytes made up of in a lead acid battery
sulphuric acid (30%) and distilled water (70%).
what is the most basic coin cell
mercury oxide coin cell
what is the electrolyte in the mercury oxide coin cell
potassium hydroxide
what does connecting unlike terminals of power sources create
a series connection
what does the series connection of power source do with the voltage
it increases it
what is the current going through a series circuit
constant
what does connecting like terminals of power sources to each other create
a parallel connection
what does a power source generate
a voltage
what do all electrical supplies have
internal resistance
what is the on-load terminal voltage equal to
the electromotive force - EMF
What is the positive and negative plate on a lead acids battery
Positive - lead peroxide
Negative- spongy lead
What is the final discharge voltage of a lead acid battery
1.83 V
What will the voltage of a nickel cadmium battery be after discharged
1.0v
What is the positive and negative plate on a nickel cadmium battery
Positive - nickel oxyhydroxide
Negative - metallic cadmium
When is the electrolyte level in a nickel cadmium battery at its lowest
After discharge
