Posted by admin | Posted in Uncategorized | Posted on 04-04-2010
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Can some help me understand how to calculate Electric power?
Several appliances in a house contribute to the home's overall energy consumption. If a toaster (R=18.0 ohms), an air conditioner (R=24.0 ohms), and an electric lamp (R=192 ohms) are all plugged into 120.0V outlets, what is the power use of each appliance? What is the overall power use?
Power is Watts or Volt Amps
Volt Amps is just that, Volts X amps
To find Amps you have to use Ohms Law
Amps = Voltage (120 volts) divided by Resistance (or Ohms)
I= E/R
So in this case for the first appliance using 18 Ohms at 120 volts the Amps (I) is going to be 120 divided by 18 which gives you 6.66 Amps.
The power use of VA of that appliance or the wattage it is consuming is then 6.66 X 120 volts or 799 VA (Volts times Amps)
The Ac has 24 ohms so the amps is 120 divided by 24 or 5 Amps which gives you 600 Va.
The lamp at 192 ohms is BS to begin with because if it was 192 ohms it wouldn’t even come on. (You cant have more resistance than the voltage pushing the amperage, nearly physically impossible and this is why)
120 divided by 194 gives you .61 amps which gives you a near zero power factor but for your purposes we’ll go with it and say .61 X 120 gives you 7.32 VA.
So total Power use is 7.32 VA plus 799 VA plus 600 VA which gives you a total power use of 1406.32 VA or “power use.”
Find the Amps using OHMS Law then find the Power use by Multiplying the Voltage of the source times the Amperage of the device, motor, appliance what have you. Hope it helps.
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