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Power

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Rural Technology

Power is the rate of work done or rate of energy consumed. We can manually pedal a wheel of bicycle at 1 revolution per second. If we want to turn the same wheel with 10 revolutions per second, we need more power and will use engine.

The SI unit for power is watt. One watt is equal to 1 Newton-meter per second (Nm/s). If you were pushing on something with a force of 1 N, and it moved at a speed of 1 m/s, your power requirement would be 1 watt.

British unit of power is horsepower. The conversion is as follows: SI: Watts (W) 1000 W=1 kW Kilowatt (kW) 1kW = 1.341 hp Horsepower (hp) 1 hp = 0.746 kW

Intext Questions

i) Fill in the blanks:

  1. Power is rate of done.
  2. Torque is force that tends to things.
  3. Work is application of over a distance.
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