Agree, sorry that my original wasn't clear on that.
First commute on e-mtb
- Thread starter mustang1
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Agree, sorry that my original wasn't clear on that.
Sorry but that part was correct. Electrical power is current (amps) x voltage (volts) expressed in watts. It IS an instantaneous measurement. You need a time component to get an total energy. A watt-hour is 1 volt x 1 amp-hour.
I don't quite understand your sentence, but for the avoidance of doubt:
Amps, Watts, and Volts are all different units used to describe different aspects of electricity:
- Amps(Amperes) measure the flow of electrical current (charge) through a circuit.
- Watts measures the rate of energy consumption or generation, also known as power.
- Voltsmeasure the force or potential difference that drives the flow of electrons through a circuit.
From https://www.anker.com/blogs/others/basics-of-watts-to-amps
The emboldened is correct - see the link I provided which says the same thing, to quote directly
Every single reputable source will give you the same, as has everyone here.
I would be *very* interested in a source which disagrees that Watts= Amps*Volts.
I look forward to you providing one!
Yours was the error I'm afraid.
The WATT is the SI unit of power, the JOULE is the SI unit of energy. However watt-hour (Wh) is a commonly used unit of energy capacity for a battery. 1 Watt-hour is 3,600 joules
OP
OP
mustang1
Legendary Member
- Location
- London, UK
One thing I noticed about my battery is after a full charge (10 bars), it very quickly shows 9 bars. This morning for example, after only 10 minutes at max power, it showed 9 bars.
My guess is battery degradation (2 year old battery, 1700km on bike, battery is charged "carefully" (meaning, up to 100% on the day before I want to use the bike and never gone below 30%). I was hoped the battery did degrade that much after only 2 years and that little mileage but it's ok I suppose, still more than meets all my needs.
My guess is battery degradation (2 year old battery, 1700km on bike, battery is charged "carefully" (meaning, up to 100% on the day before I want to use the bike and never gone below 30%). I was hoped the battery did degrade that much after only 2 years and that little mileage but it's ok I suppose, still more than meets all my needs.
Well, that irrefutable logic combined with the authoritative references certainly has me convinced!
albion
Guru
Anyone want to expand on this. It might be best if all replies get deleted after the "wh = Amps multiplied by Volts" posting. It simply lost the plot afterwards.
Raw power is often expressed in Amps like you get with a car battery crank power. However we were never multiplying by crank power, were we?
I think it would probably help clarity if you provided an equation, ideally with a reference, rather than text alone as it can be very ambiguous.
I've no experience of "crank power" but could imagine it's a very loose description of "oomph" rather than "power" in the engineering sense.
For example "Crank Power (watts) = Battery current (amps) * [anything else you feel is included"
In the case of an ebike, I stand by "Instantaneous Power (watts) = Current (Amps) * Voltage (Volts)" as per the references provided.
