Watt and milliwatt
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Watt and milliwatt
Watt ( W ) – Unit of power (absolute)
- A watt ( W ) is the basic unit of power.
- One watt is equal to 1 ampere (amp) of current flowing at 1 volt. (Watt = Amp x Volt)
- A watt is very similar to the output of the power washer.
- Instead of the pressure generated by the machine, electrical systems have voltage. Instead of water flow, electrical systems have current, which is measured in amps. So the amount of watts generated is equal to the volts times the amps.
- Based on the above analogy:
- Pressure = Voltage (Volt)
- Water Flow = Current (Amp)
Milliwatt (mW) – Unit of power (absolute)
- A milliwatt is 1/ 1,000 of a watt.
- Most of the indoor 802.11 equipment transmits at power levels between 1 mW and 100 mW.
- Only rarely, in point-to-point communications, such as in building-to-building bridge links, you use 802.11 equipment with more than 300 mW of transmit power.
Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.
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