Delmar's Unit 12 Flashcards
What converts chemical energy into electrical energy?
a voltaic cell
What is a battery composed of?
a group of cells connected together
Can primary cells be recharged?
No
Can secondary cells be recharged?
Yes
How is a voltaic cell constructed?
almost any two unlike metals and an electrolyte of acid, alkali, or salt
What is the amount of energy a battery can contain called?
capacity or energy density
How are secondary cells recharged?
By reversing the current flow through them
What is produced when lead-acid batteries are charged?
hydrogen gas
What is the life span of nickel-cadmium batteries?
2000 charge-discharge cycles
When cells are connected in series their voltages ____ and their ampere-hour capacities ________.
add, remain the same
When cells are connected in parallel their voltages ____ and their ampere-hour capacities ________.
remain the same, add
Cells or batteries of different voltages should never _____
be connected in parallel
From what do solar cells produce electricity?
lightt
How is the voltage of a solar cell determined?
the materials from which it is made
How is the current of a solar cell determined?
the surface area
How do thermocouples produce a voltage?
when a junction of two unlike metals is heated
How is the voltage produced by a thermocouple determined?
the type of materials used and the temperature difference
What is it called when thermocoulpes are connected in series to create a higher voltage?
thermopile
What is it called when pressure is applied to crystals to produce a voltage?
piezoelectric effect
