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From: Zen Cycle <funkmaster@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Suspension losses
Date: Wed, 15 Jan 2025 13:28:13 -0500
Organization: A noiseless patient Spider
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On 1/15/2025 1:16 PM, Frank Krygowski wrote:
> On 1/15/2025 1:05 PM, Zen Cycle wrote:
>> On 1/13/2025 11:03 AM, Frank Krygowski wrote:
>>>
>>> It's certainly true that 100% of the electricity consumed by an 
>>> electric blanket becomes heat.
>>
>> No, that isn't true either. 
> 
> Please explain. What electrical energy goes elsewhere?

A very small amount of power is used for the indicator lighting and 
electronic controls.

> 
>> I write "either" because even _if_ it were true that electric heaters 
>> are 100% efficient (which isn't true), saying 100% of the electricity 
>> consumed by the device become heat is very different than saying it's 
>> 100% efficient.
> 
> What's your definition of "efficiency?" As I said earlier, I think a 
> common one used for engineering matters is Desired Output divided by 
> Required Input, or something similar.
> 
> Do you have a different one?

Nope, it's the notion that every watt of power directly goes into 
heating the targeted space that I'm stuck on. There are other losses in 
the cabling and plug interface which - while realized as heat - do not 
contribute the heating of the targeted space. The heat generated by the 
plug and cord are rather well insulated.

You may have experienced unplugging an electric appliance and felt the 
plug to be hot. What's happening is that the resistance of the 
plug/socket interface generates heat. In those cases you were able to 
touch the actual metal contacts inside the plug, it's likely it would 
leave a blister. The fact that it doesn't shows the insulation is 
preventing the heat from leaving the system - IOW, not 100% efficiency.

> 
> 


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