H7/H8 Flashcards
What is a cell?
A basic unit that converts chemical energy to electrical energy
What is a battery?
An arrangement of cells connected in series or parallel to supply the appropriate voltage and current
How are cells connected to increase voltage?
Parallel
How are cells connected to increase current?
Series
What are the two main types of cells?
Primary / dry cells
Secondary / wet / storage cells
Rules for batteries are found in what section?
Section 64
Most common types of dry cells?
Carbon zinc
Zinc chloride
Alkaline
Mercury
Silver oxide
Lithium
Most common wet cells?
Lead-acid
Nickel-iron
Nickel-cadmium
What is a hydrometer used for?
To check the electrolyte level in wet batteries.
Red - discharged
White - charging required
Green - charged
How is running voltage determined?
Testing under load
What is memory effect?
Causes a battery to charge to less than full rated charge, specific to applications of sintered plate nickel-cadmium rechargeable batteries
EM rule. If supply voltage exceeds __v or input exceeds __A unit equipment must be ____
250v
24A
Permanently connected
Which table is for EM voltage drop?
Table D4
Small wind systems
One or more wind turbines rated up to and including 100kw
Large wind system
Exceeds 100kw
