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Why is it important that the resistance of an extension cord used to power an electric heater be kept low?
Wiki User
∙ 9y ago
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.
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoA high resistance cord will deliver less power to the heater- but the cord will get hot.
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An electric heater is stretched to increase its length by 25 percent what is the increase in resistance?
In this case, the resistance will increase in inverse proportion to the wires new diameter, and in direct proportion to the wires new length.
Which electric heater will yield the greater heat output a large resistance in the coil or a small resistance in the coil?
With the same voltage across two conductors, the conductor with the smaller resistance will dissipate more power, i.e. generate more heat.
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.
How does a resistor help an electric heater?
An electric heater is a resistor. It is a resistor with the right amount of resistance to take the required amount of power at the specified voltage. With a case to put it in and louvres to let the warm air circulate, that is a heater.Resistance in ohms is equal to the voltage-squared and divided by the watts.
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.
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
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 costs more in electricity - electric heater or electric guitars?
electric heater
Which element are used as an electric heater filament?
Nichrome wire is commonly used for resistance wire for heater elements and it is a non-magnetic alloy of two elements nickel and chromium. It has high resistance and resists oxidation. The electrical resistivity is about 65 times that of copper.
An electric heater is stretched to increase its length by 25 percent what is the increase in resistance?
In this case, the resistance will increase in inverse proportion to the wires new diameter, and in direct proportion to the wires new length.
Is the hot water heater gas and electric?
Gas heater & electric heater both are available.
Which electric heater will yield the greater heat output a large resistance in the coil or a small resistance in the coil?
With the same voltage across two conductors, the conductor with the smaller resistance will dissipate more power, i.e. generate more heat.
