ELCTK 131 CH 10
The internal resistance of a good cell is about
1 ohm
A lithium cell can provide how many times more energy than the equivalent carbon-zinc cell?
10
Which of the following is an advantage of the nickel-metal-hydride cell?
40% more capacity than a NiCd
An applied voltage higher than the end of one cell can be obtained by connecting cells in parallel.
False
An internal resistance of 100 Ω is considered good for a voltage cell.
False
The simplest and most fundamental way to charge a secondary cell or battery is simply to apply to it an AC voltage somewhat higher than the final open circuit voltage of the battery.
False
The lead-acid cell cannot be recharged.
Fasle
A battery is a group of cells that generate energy from an internal chemical reaction.
True
A carbon-zinc D cell may operate for only a few hours with continuous drain at its rated current
True
A dry cell has a moist electrolyte.
True
A lithium cell can provide at least 10 times more energy than the equivalent carbon-zinc cell.
True
All types of portable power tools use NiMH, Nickel Cadmium or lithium batteries
True
At the heart of all modern chargers is an integrated circuit (IC) and numerous discrete components making it a small system.
True
Hybrid electric vehicles use very high voltage lithium ion or NiMH batteries.
True
Mercury cells are becoming increasingly unavailable due to hazards associated with proper disposal after use.
True
Primary cells cannot be recharged.
True
The device for converting chemical energy into electrical energy is sometimes called a galvanic cell.
True
Where a high level of load current is necessary, the lead-acid cell is the type most commonly used.
True
What cell has an output of 1.5 V and is available as either a primary or secondary cell and lasts much longer than a carbon-zinc cell?
alkaline
A common rating used with lead-acid batteries is
ampere-hours
Fuel cells
are still impractical for most applications because of their size and cost
A group of cells that generate energy from an internal chemical reaction is a(n)
battery
The combination of cells is called a
battery
Batteries are important because they are used in
cell phones laptop computers hybrid/electric vehicles
A generator with a very low internal resistance is considered a
constant-voltage source
A method in which a charger and a battery are always connected to each other to supply current to the load is referred to as
float charging
Which of the following is a chemical source of direct current but does not contain chemicals?
fuel cell
Any source that produces voltage output continuously is a
generator
For more current capacity, the battery
has cells in parallel
What device is used to check the specific gravity of a lead-acid battery?
hydrometer
When a high level of current is necessary, which cell is most commonly used?
lead-acid
The carbon-zinc cell is very common because of its
low cost
What cells are becoming increasingly unavailable due to the hazards associated with proper disposal after use?
mercuric oxide
What type cell has the ability to deliver high current and be cycled many times for recharging?
nickel-cadmium
A type of cell that cannot be recharged is a
primary cell
A storage cell that can be recharged by reversing the internal chemical reaction is called a
secondary cell
Voltage cells made of semiconductor materials are classified as
solar
The ratio comparing the weight of a substance with the weight of water is called
specific gravity
A secondary cell is also known as a
storage cell
A device for converting chemical energy into electrical energy is a(n)
voltaic cell
