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It takes approximately 4.184 Joules of heat to raise the temperature of 1 gram of water 1 degree C. 1 Joule is the energy of 1 Watt for 1 second (or 3,600,000 Joules equals 1 Kilowatt-hour). In more real world numbers: It takes 69.7 watts 1 minute to heat a liter of water 1 degree C; or 146.6 watts in 1 minute to heat a gallon of water 1 degree F. A watt is a watt, weather it comes from resistance, radiant or induction. The only variations will come from the efficientcy of the heat source's design and how it is being used.
Wiki User
∙ 12y ago
Wiki User
∙ 11y ago1 V = 1 J / A * s.
If you know the current, the voltage, and the amount of time the circuit was in operation, then you can calculate the number of joules of heat produced.
Since a watt is a joule per second, you can also calculate it from the wattage if you have that information handy.
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Is there any theory that can calculate that how much heat can be produced from a convex lens?
A convex lens cannot produce heat. It can focus incident heat to a smaller area so that it is more intense.
How do you calculate contact resistance?
Resistance is resistance , no matter if it is contact resistance or any other resistance. And formula is R = V / I.
How to calculate the heat produced in a resistor?
Resistors dissipate heat energy with power P=I2R. Since power is defined as energy gained or lost per unit time, we can solve for the energy lost using E=Pt, where E is energy (joules), P is power, and t is time (seconds).Finally, substituting the definition of power into the equation you get:E=I2RtAnswerWith difficulty. The original answer, unfortunately, tells us the work done on the resistor and not the heat transfer from the resistor, which is what the questioner is asking.The work done on the resistor is the product of the square of the current and the value of its resistance. This will increase the internal energy of the resistor and increase its temperature above that of its surroundings, and heat, by definition, is the energy transferred from the higher temperature resistor to its cooler surroundings.So there are simply too many unknown variables to take into account: the mass of the resistor, the specific heat capacity of the material from which it's made, the temperature difference between the resistor and its surroundings...
A flat iron that has a resistance of 10 ohms is used for about 4 hourshow much heat is produced if the current is 10 amperes?
This can be calculate quite simply using the following steps. First calculate the power loss (as heat energy) from the iron using the relationship: P= I2R, P is power in Watts, I is current in Amps, R is resistance in Ohms. In this case P = 102 x 10 = 1000 W Next convert 4 hours into the standard time unit, seconds. 4 hours = 60 seconds per minute * 60 minutes per hour * 4 hours = 14400s Finally calculate how much heat energy is produced during this time using the relationship: E = Pt, P is power in Watts, E is energy in Joules, t is time in seconds. In this case E = 1000 x 14400 = 14400000 J Or more appropriately 14.4 MJ (megajoules). Hope this helps, Tom
How do you calculate work output for a simple machine?
The resistance force multiplied by the resistance distance.
When current flows through a resistance is heat produced?
Yes, heat energy is produced by the electrons;however small it may be,actually if we consider a resistance then it is an hindered to the flow of electrons,as a result of which the electrons collide with the particles of wire resulting in loss of energy in the form of heat.the equation of heat generated is: H=(I^2 *R*t) where- H=heat produced in joules R=resistance of the material in ohm t=time of current flow in seconds
Why does electrical resistance cause heat to be produced?
Energy is given off in the form of heat because energy cannot be created or destroyed so it has to go somewhere in the form of light or heat.
What are the functions of hot filament in physics?
To provide sufficient resistance to electrons so that heat produced will cause thermionic emission.
Does the amount of heat produced depend on the material of the conductor?
Yes, resistance in a conductor causes energy losses due to heat. Metals such as Gold and Platinum have very low resistance but they are very expensive so Copper and Aluminium are used instead which are much more affordable but have higher resistance.
How is heat energy produced in electric iron?
A resistor placed across the power line: I squared R (current x current x resistance) = heat in watts.
Is there any theory that can calculate that how much heat can be produced from a convex lens?
A convex lens cannot produce heat. It can focus incident heat to a smaller area so that it is more intense.
Do alloys produce heat resistance?
Alloys can add heat resistance to a metal
On what factors does the amount of heat produced in an electric wire depend?
-- The resistance of the wire.AND-- The voltage between the ends of the wire.OR-- The current through the wire.
What is the difference between heat of reaction and molar heat of reaction?
Heat of a reacion is the totall amount of heat a reaction produces. Molar heat of a reaction is the heat produced/mol if you have the molar hear of the reaction you can calculate the heat of the reaction based on the moles of reactants you have
How do you calculate contact resistance?
Resistance is resistance , no matter if it is contact resistance or any other resistance. And formula is R = V / I.
How do you calculate resistance box for slip ring motor?
how to calculate resistance box for slipring motors
How to calculate the heat produced in a resistor?
Resistors dissipate heat energy with power P=I2R. Since power is defined as energy gained or lost per unit time, we can solve for the energy lost using E=Pt, where E is energy (joules), P is power, and t is time (seconds).Finally, substituting the definition of power into the equation you get:E=I2RtAnswerWith difficulty. The original answer, unfortunately, tells us the work done on the resistor and not the heat transfer from the resistor, which is what the questioner is asking.The work done on the resistor is the product of the square of the current and the value of its resistance. This will increase the internal energy of the resistor and increase its temperature above that of its surroundings, and heat, by definition, is the energy transferred from the higher temperature resistor to its cooler surroundings.So there are simply too many unknown variables to take into account: the mass of the resistor, the specific heat capacity of the material from which it's made, the temperature difference between the resistor and its surroundings...
