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