A unit of electrical energy equal to the power of one watt in use for one hour; often used as a unit of electricity consumption. It is equal to 3600 joules.
Used in a Sentence
watt-hour
Definition, parts of speech, synonyms, and sentence examples for watt-hour.
Editorial note
The iPad 3 and 4 had a 42 watt-hour battery, but the iPad Air has a 32 watt-hour battery.
Examples14
Definitions1
Parts of speech1
Quick take
A unit of electrical energy equal to the power of one watt in use for one hour; often used as a unit of electricity consumption. It is equal to 3600 joules.
Meaning at a glance
The clearest senses and uses of watt-hour gathered in one view.
Definitions
Core meanings and parts of speech for watt-hour.
noun
A unit of electrical energy equal to the power of one watt in use for one hour; often used as a unit of electricity consumption. It is equal to 3600 joules.
Example sentences
The iPad 3 and 4 had a 42 watt-hour battery, but the iPad Air has a 32 watt-hour battery.
It has a 50 watt-hour battery, which lasts 7 hours, so it uses ~0.12 watt-hour/minute.
Really disappointing that it only gets 5.5 hours of Wi-Fi browsing with a 91 watt-hour battery (on integrated graphics).
Apple's battery replacement service for the 91 watt-hour battery on the MacBook Pro Retina is $199.
Since the album has ten tracks of around 30s, that's 5 minutes * 0.12 Wh/m, so ~0.6 watt-hour in total.
Nobody can match the hours of use per watt-hour of their tightly-integrated stack.
The newer wireless ones do give full-time total watt-hour data.
I assume cost per watt-hour is the dominant factor.
It's probably because it's a more convenient unit to use when talking about electrical energy consumption, because 1 watt-hour is the energy consumed by something that has 1W of power running for one hour.
None of those aspects you listed are unique to Apple anymore, from the machined aluminum chassis to magnetic power connectors or superior battery tech (the Sony Vaio Pro 13 gets significantly more minutes-per-watt-hour than a new MBA for example).
When it comes to grid or off-grid storage, you don't need the best energy density as cost per watt-hour is probably the most important factor and there are already other chemistries on the market that will work just fine with many more on the way.
Quote examples
The next two weeks after that will have reduced efficiency by a similar amount again, until you reach the "break-even point" where each watt-hour of electricity you buy and pump through the mining equipment is going to yield an amount of bitcoins equivalent in value to the energy you put in.
What I mean is that if I had to itemize every gallon of water, every kilowatt-hour (or watt-hour) of electricity, every cubic foot of natural gas, every byte I upload or download, etc etc etc to come up with their "true" values I wouldn't have enough hours in the day to do 10% of what I normally do.
Proper noun examples
I think you mean 25 grams/Watt-hour and keep in mind that you need ~12 hours of energy storage.
Frequently asked questions
Short answers drawn from the clearest meanings and examples for this word.
How do you use watt-hour in a sentence?
The iPad 3 and 4 had a 42 watt-hour battery, but the iPad Air has a 32 watt-hour battery.
What does watt-hour mean?
A unit of electrical energy equal to the power of one watt in use for one hour; often used as a unit of electricity consumption. It is equal to 3600 joules.
What part of speech is watt-hour?
watt-hour is commonly used as noun.