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Why is it important that the resistance of an extension cord used to power an electric heater be kept low?
An electric heater is one of the high-power appliances in a house, commonly taking 1.5 to 3 kilowatts of power. The current is high, and therefore there is a drop in the voltage applied to the heater equal to the current multiplied by the resistance of the cord.
There is probably little power wasted, because any heat from the cord goes to heat up the same room. But a voltage drop causes the heater to draw less current because its resistance is constant, and therefore less total power is provided to heat the room.
If the heater is thermostatically controlled so that it is not working all the time, the difference is small because any reduction in the heater's power would cause the thermostat to keep it going for longer, to compensate.
What else can I help you with?
An electric heater is stretched to increase its length by 25 percent what is the increase in resistance?
The resistance of the electric heater will increase by approximately 56.25% (25% increase in length results in a 56.25% increase in resistance). This relationship is given by the formula: new resistance = (1 + 0.25)^2.
Can the cord on an electric heater be lengthened?
Yes, but with a heavier gauge wire <<>> If the cord on an electric heater needs to be lengthened as a perminant feature then the whole cord should be replaced with a new cord of the same type and wire size. What this prevents is aquiring bad splice connections at the point the connection is made. Bad splice connections will create hot spots in the cable. If the lengthening of the cord is just a temporary fix, just use an extension cord. The extension cord should be the same wire size as the heater cord. Keep the extension cord under 20 feet in length.
What is the resistance when a 660w electric heater is operated from a 120v lines?
We have to work this problem on a DC basis, since we know nothing about the power factorof the supply, or the reactance of the heater.Power in the load = E2 / R.So R = E2 / P.R = (120)2 / 660 = 21.82 ohms (rounded)That's the resistance of the heater ... as the question is worded, it's not clear that thequestioner understands this.
What are the features of an efficient electric heater?
The main feature of an efficient electric heater is, that is used up to 30% less engery than a conventional electric heater. This reduces the cost of the heater.
Which electric heater will yield the greater heat output a large resistance in the coil or a small resistance in the coil?
A small resistance in the coil will yield greater heat output in an electric heater. This is because a small resistance allows for a larger current to flow through the coil, which in turn generates more heat due to the increased power dissipation (P = I^2 * R).
Does an electric motor have different resistance than an electric heater?
Yes it would be unlikely an electric motor coincidentally exactly matched the resistance of an electric heater.
What is stepped resistor?
The resistance that controls a heater motor in the electric system .
What is the voltage of a small electric heater if the heater is drawing 12 amperes and has a resistance of 10 ohms?
Voltage is current times resistance, 1.2 x 110 = 132 volts.
Why does the cord of an electric heater not glow while the heating element does?
The heating element of an electric heater is a "resistor", the cord which conducts the electricity is not. The resistance of the element of an electric heater is very high. As current flows through the heating element, it becomes red hot and glows. On the other hand, the resistance of the cord is low. It does not become red hot when current flows through it.
How much current will an electric heater draw from a 110-volt line if the resistance of the heater when hot is 26.7 ohm?
4.12A. V=IR
An electric heater is stretched to increase its length by 25 percent what is the increase in resistance?
The resistance of the electric heater will increase by approximately 56.25% (25% increase in length results in a 56.25% increase in resistance). This relationship is given by the formula: new resistance = (1 + 0.25)^2.
How many amps will an electric heater use if 440 volts are applied to it and the resistance is measured at 80ohms?
The formula you are looking for is I = E/R. Amps = Volts/Resistance.
In a home that has 120 v service heating is provided by electric resistance heat with an overall resistance of 40 ohms hom much heating power will the electric resistance heater generate?
The formula you are looking for is W = E(squared)/R, W = Voltage (squared) divided by Resistance.
What energy transfers are used in the electric coil of a basebord heater?
The energy transfers in the electric coil of a baseboard heater involve electrical energy being converted to thermal energy through the resistance of the coil. When current flows through the coil, the resistance generates heat, which warms the surrounding air in the room.
What costs more in electricity - electric heater or electric guitars?
electric heater
What safety precautions should I consider when using a space heater with an extension cord?
When using a space heater with an extension cord, it is important to consider the following safety precautions: Use a heavy-duty extension cord that is rated for the wattage of the space heater. Do not overload the extension cord with other devices. Keep the extension cord away from high-traffic areas to prevent tripping hazards. Inspect the extension cord regularly for any signs of damage or wear. Do not run the extension cord under rugs or carpets. Do not use a damaged or frayed extension cord. Always plug the space heater directly into the wall outlet when possible for optimal safety.
Can the cord on an electric heater be lengthened?
Yes, but with a heavier gauge wire <<>> If the cord on an electric heater needs to be lengthened as a perminant feature then the whole cord should be replaced with a new cord of the same type and wire size. What this prevents is aquiring bad splice connections at the point the connection is made. Bad splice connections will create hot spots in the cable. If the lengthening of the cord is just a temporary fix, just use an extension cord. The extension cord should be the same wire size as the heater cord. Keep the extension cord under 20 feet in length.
