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Extension Cord
Electric Space Heaters Plugged Into Extension Cords Can Cause a Fire!
According the United States fire Administration 3,500 lives are lost, 20,000 injuries occur, and billions of dollars in damages happen each year from fires. More often than not these fires occur during the winter months of December, January, and February when temperatures are at their lowest. Many of these fires are preventable as they are started from improper usage of heating devices.
Portable space heaters are a common appliance in many homes. To avoid the high cost of gas heat many families will use electric space heaters to keep the house warm and the thermostat lower. One may find a space heater in each bedroom and living areas of the home plugged into extension cords. This unfortunately is a bad idea and has a serious potential to cause an electrical fire. It is recommended that if one must use an extension cord that it is heavy duty and supports at least the same voltage as the heater if not more and to never plug in other devices. Unplug the heater when not in use and never leave it running while asleep. Make sure to keep heaters at least three feet away from clothing, bedding, furniture, children, and pets. Never place anything on top of a space heater, and use only heaters that will turn off if they fall over.
The most common reason that fires occur from space heaters is that there is too much power being pulled from wiring in the home. Work with your local electrician to make sure you can safely use space heaters. In Atlanta, for instance, call an Atlanta electrician to make sure the wiring in the house is up to code and it is safe to use space heaters before plugging in the devices. An Atlanta electrical contractor should be able to assess how much voltage the wiring in the house can handle and give homeowners a good idea of how much is too much. With all the modern devices Americans use, especially in older homes, it's likely that the electric system within the home has the capability to withstand the extra watts needed to run multiple space heaters.
Extension cords will not protect portable space heaters from surges and can heat up rather quickly from electric currents causing the extension cord to melt and create a fire hazard. Make sure to check both the extension cord and electric space heater for any splits, or exposed wiring before use. If the device is overheating or in is need of any repairs call a professional electrical contractor.
About the Author
Avoid fire hazards by ensuring your home's electrical systems are safe and that you use safe practices. Searching for Electricians Atlanta? If you need help with electrical service, repairs, and upgrades for the Atlanta area, contact McCall Enterprises at Electrician Atlanta.
An extension cord is used with an electric weed trimmer that has a resistance of 12.1?
An extension cord is used with an electric weed trimmer that has a resistance of 12.1 . The extension cord is made of copper wire that has a cross-sectional area of 1.47 x 10-6 m2. The combined length of the two wires in the extension cord is 87.2 m. (a) Determine the resistance of the extension cord. (b) The extension cord is plugged into a 120-V socket. What voltage is applied to the trimmer itself?
Because we have a load (weed trimmer) with resistance and wire with resistance, they both will have voltage drops across them. Therefore, the voltage applied to the load (weed trimmer) will be equal to the source voltage (120 volts) minus the wire resistance voltage drop (unknown).
We are given the value of the weed trimmer resistance. But we need to calculate the wire resistance.
Resistance of wire = R * L / A {from first source link I posted below}
L = total length of wire in meters
A = cross-sectional area of wire = 1.47 * 10^(-6) meters²
R = resistivity of copper = 1.68 * 10^(-8) Ω-meter {from second source link I posted below}
Resistance of wire = (1.68 * 10^(-8)) * (87.2) / (1.47 * 10^(-6))
Resistance of wire = 99.66 * 10^(-2)
Resistance of wire = 0.9966 Ω
Resistance of wire = 1 Ω (rounded)
We now have a simple series circuit with a source voltage, the wire resistance, and the weed trimmer resistance. So there will be a voltage drop across the wire resistance and a voltage drop across the weed trimmer resistance.
Since the weed trimmer resistance (12.1 Ω) is much greater than the wire resistance (1 Ω), the voltage drop across the weed trimmer will be proportionally much larger than the voltage drop across the wire resistance.
To calculate the voltage applied to the weed trimmer, you have a simple voltage divider network where the voltage drop across the weed trimmer is proportional to the ratio of its resistance divided by the total resistance of the circuit. {see third source link I posted below}
= source voltage * trimmer resistance / total resistance
= 120 * (12.1 / (12.1 + 1)
= 120 * (12.1 / 13.1)
= 110.84 volts
Therefore, with a 120 volt source, there will be 110.84 volts dropped across the weed trimmer and 9.16 volts (= 120 - 110.84) dropped across the wire resistance.
Extension Cord Storage