The heating element in the electric kettle will be primarily pure resistive. Power in that case is calculated
P = E*I = 250V*I = 3000 W
So the current is
I = 3000 W/250 V = 12 Amps
If there is anything else (lights, radio, PC, etc.) on the circuit that may be taking some current you are very likely to go over 13 A frequently. I don't know how accurate you can expect a fuse's blow point to be. Perhaps +/- 10%? Doesn't seem very trouble free.
Even if the circuit is dedicated to the kettle, consider this idea. We don't know exactly what conditions the manufacturer was considering when specifying the wattage. Probably operating conditions, when the element was hot. Then Ohm's Law tells us that the resistance R is
R = E/I = 250 V/12 Amps = 20.8 Ohms
But the element's resistance would be lower at first when it is cold.
My calculations indicate that if the element is made of nichrome wire, and if the temperature change is 200 degrees C, the hot resistance of 21 Ohms is probably about 1.7 Ohms higher than when at room temperature. If that is true, when you first turn it on, Ohm's Law says that the initial current should be 12.95 Amps.
Regardless of this analysis, remember that the fuse requirement is based on the size of the wires in the wall. You don't want those wires to get hot. Don't put in a bigger fuse than what was there originally.
The wire in the cord has much lower resistance than the heating element. The heating element is a resistive or resistance heating element. Resistance in the quality of a substance or material that causes it to limit current flow, and it get heated up in the process. The heating element has all but the smallest fraction of the resistance in the circuit, so the heat, that thermal energy that get the water hot, is generated by the resistance of the heating element.
The element is made of special high resistance wire so the power is dissipated in the element rather than the low resistance cord.Power(watts) = Resistance (ohms) X {Current(amperes)}squared
The higher the resistance the lower the current flow. It restricts the flow of electrical current. The resistance will not depend upon the current. The current flow will depend on the resistance.
The question is actually wrong, they can both have the same resistance if configured differently, the real question should be which has a higher resistivity which is the electrical resistance found in a standard amount of each material. In this case Manganin has a higher resistivity than copper.
Low resistance. Think of Ohm's law. Voltage drop is directly proportional to resistance. The higher the resistance, the higher the voltage drop, and the less voltage that is available for the load. Think of conductor resistance as a resistance in series with the load. Also, higher conductor resistance means more power lost, going to heating the conductors. The "line loss" formula is P=I2R. The greater the resistance, the greater the electrical power being converted into thermal power heating the conductors.
Heating is caused by current flow. Certain types of wire like tungsten emit more heat than other types. Lower resistance means higher current for a fixed voltage per Ohm's Law. So the efficiency of heating with electricity depends on the material of the conductor, the operating voltage and the resulting current. In most instances this will be a low resistance with high conductivity.
The wire in the cord has much lower resistance than the heating element. The heating element is a resistive or resistance heating element. Resistance in the quality of a substance or material that causes it to limit current flow, and it get heated up in the process. The heating element has all but the smallest fraction of the resistance in the circuit, so the heat, that thermal energy that get the water hot, is generated by the resistance of the heating element.
The wire in the cord has much lower resistance than the heating element. The heating element is a resistive or resistance heating element. Resistance in the quality of a substance or material that causes it to limit current flow, and it get heated up in the process. The heating element has all but the smallest fraction of the resistance in the circuit, so the heat, that thermal energy that get the water hot, is generated by the resistance of the heating element.
Because Heat is Directly Proportional to Resistance Of ElementAnswerPower is inversely, not directly, proportional to the resistance of a heating element.So, the higher the resistance, the lower the heating effect. For example, a 'high-wattage' lamp has a lower resistance than a 'low-wattage' lamp.This is because power is equal to the voltage squared divided by resistance; so, the lower the resistance, the more powerful (and, therefore, the hotter) the heating element.
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.
tungsten has high resistivity and resistance but at a higher temperature it becomes hot and oxidised and melted so we can't use tungsten as heating coil
1). You want the resistance of the heating element to be somewhat more than the resistance of a pure iron one. 2). When the heating element heats up to glowing, you don't want it to melt and fall to the bottom of the toaster in a blob. So you need a substance with a melting temperature higher than that of pure iron.
it is similar to that of heating a metal heating a metal leads to increase in resistance thus both laser shot or heating are form of heat transfer that leads the atoms to higher energy states causing random movement of electrons vigorously which increases resistance
Positive temperature coefficient heating element. Resistivity grow larger with higher temperatures so the heating element should be self regulating.
The heating element in electric heaters and irons is made from an alloy of nickel and chronium called nichrome. It is usually made in the form of wire. The wire is often wound around a flat sheet of mica for support. Mica is a thin layered mineral that can withstand high temperatures.
It will work ok. The iron's heating element is predominately resistive in order to produce heat. If the heating element is coiled, it will have a small inductive reactance which acts similar to a resistance to current flow but does not contribute to heating. At a higher a.c. frequency (60 Hz instead of 50 Hz) it will have a slightly higher inductive reactance and, therefore, a slight reduction in heat production.
Conductors have low resistance. Recall Ohm's law. The higher the conductor resistance, the greater the voltage drop along the conductor, and the less voltage that is available for the load. The conductor resistance is a resistance in series with the load. Also, higher conductor resistance results in more electrical power being converted into heat, warming up the conductors. This is calculated with the formula P=I2R. The greater the resistance, the greater the power wasted heating the conductors.
The element is made of special high resistance wire so the power is dissipated in the element rather than the low resistance cord.Power(watts) = Resistance (ohms) X {Current(amperes)}squared