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For example, assuming no wind, one gets the following results for power delivered to the pedals (watts): 175 W for a 90 kg bike + rider to go 9 m/s (32 km/h or 20 mph) on the flat (76% of effort to overcome aerodynamic drag), or 2.6 m/s (9.4 km/h or 5.8 mph) on a 7% grade (2.1% of effort to overcome aerodynamic drag).
A motorised bicycle allows human power and the assistance of a 49 cm 3 (3.0 cu in) engine, giving a range of 160 to 200 mpg ‑US (1.5–1.2 L/100 km; 190–240 mpg ‑imp). [citation needed] Electric pedal-assisted bikes run on as little as 1.0 kWh (3.6 MJ) per 100 km, [55] while maintaining speeds in excess of 30 km/h (19 mph).
Spring power (clock spring), torsion spring: 0.0003 [38] 0.0006: Storage type Energy density by mass (MJ/kg) Energy density by volume (MJ/L) Peak recovery efficiency %
The energy content of ethanol is 76,100 BTU/US gal (5.89 kilowatt-hours per litre), compared to 114,100 BTU/US gal (8.83 kWh/L) for gasoline. (see chart above) A flex-fuel vehicle will experience about 76% of the fuel mileage MPG when using E85 (85% ethanol) products as compared to 100% gasoline.
The SI unit of power for heating and cooling systems is the watt. Btu per hour (Btu/h) is sometimes used in North America and the United Kingdom - the latter for air conditioning mainly, though "Btu/h" is sometimes abbreviated to just "Btu". [18] MBH—thousands of Btu per hour—is also common. [19] 1 W is approximately 3.412142 Btu/h [20]
Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels. Most also include some type of a mechanism to convert speed and torque via gear ratios .
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This thermal energy input of 1 kWh = 3.6 MJ = 3,412 Btu; Therefore, the heat rate of a 100% efficient plant is simply 1, or 1 kWh/kWh, or 3.6 MJ/kWh, or 3,412 Btu/kWh; To express the efficiency of a generator or power plant as a percentage, invert the value if dimensionless notation or same unit are used. For example: