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Power
POWER is the RATE at which energy is being TRANSFERRED or WORK is being done.
The equations for power can be written as:
UNITS:
- Power, denoted by P, is measured in Watts (W).
- Energy Transferred, denoted by E, is measured in Joules (J).
- Work Done, denoted by W, is measured in Joules (J).
- Time, denoted by t, is measured in Seconds (s).
One Watt is the power from an energy transfer of one Joule per second.
If a device is rated at 1 Watt, it means that it transfers energy at a rate of 1 Joule per second.
PRACTICAL APPLICATION
- Comparing two devices, like electric motors, is a good way to understand POWER.
- Let's say we have a 8W and 2W motor lifting a 1kg weight up a height of 1m:
- If both devices lift the same weight to the same height, the one that does it faster has a HIGHER POWER because it TRANSFERS energy at a FASTER rate.
Power
POWER is the RATE at which energy is being TRANSFERRED or WORK is being done.
The equations for power can be written as:
UNITS:
- Power, denoted by P, is measured in Watts (W).
- Energy Transferred, denoted by E, is measured in Joules (J).
- Work Done, denoted by W, is measured in Joules (J).
- Time, denoted by t, is measured in Seconds (s).
One Watt is the power from an energy transfer of one Joule per second.
If a device is rated at 1 Watt, it means that it transfers energy at a rate of 1 Joule per second.
PRACTICAL APPLICATION
- Comparing two devices, like electric motors, is a good way to understand POWER.
- Let's say we have a 8W and 2W motor lifting a 1kg weight up a height of 1m:
- If both devices lift the same weight to the same height, the one that does it faster has a HIGHER POWER because it TRANSFERS energy at a FASTER rate.
