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Calculating power of heating element | Physics Forums

Jul 14, 2007 · If there is a circuit with only one heating element, how do we calculate the power it requires? According to the physics formula P=V^2/R, whenever you increase the resistance, the power it requires falls. However, I don't think that's right. Or is it? When R is increased, so the heating element will

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What is the formula for rate of heat dissipation? - Quora

May 08, 2018 · If you are talking about conduction: Q=k*A*(T1 - T2) / L where k is the thermal conductivity of the material, A is the cross sectional area, T1 is the initial (pre-diffuse or inner surface) temperature, and T2 is the temperature at the final cross

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Heat Transfer - NASA

May 05, 2015 · The value of the constant is different for different materials. Heat is always transferred from the object at the higher temperature to the object with the lower temperature. For a gas, the heat transfer is related to a change in temperature.

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The electrical power dissipated by a resistance R is - Answers

Sep 25, 2011 · P=I2R The power in watts dissipated by a resistor with the value R will be the square of the voltage drop across it divided by its resistance. P=V2/R Because E means energy we take V for voltage.

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Electrical engineering considerations for electromagnetic

Energy gain in electrical heating processes used in enhanced oil production. The efficiency factor, η, represents the ratio of the 60 Hz electrical energy produced in a given process (thermal/hydroelectric) to the energy input in each process. Electrical energy in the microwave range is produced from 60 Hz electrical energy with an approximate efficiency of 50%.

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Heat Calculations - Womack Machine Supply Company

Heat Dissipation Capacity of Steel Reservoirs. Example: If the oil temperature is 140 degrees fahrenheit, and the air temperature is 75 degrees fahrenheit, how much heat will a reservoir with 20 square feet of surface area dissipate? This company assumes no liability for errors in data nor in safe and/or satisfactory operation of equipment designed from this information.

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Turning Up the Heat on MRI - PubMed Central (PMC)

On the other hand, manufacturers do know, or could know, exactly how much power in total watts their scanners deposit into subjects. This is the RF power going into the MRI coil at its input minus the power dissipated in the coil. The weight of a subject (in kilograms) can be entered by a technologist at the MRI console.

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Calculating power of heating element | Physics Forums

Jul 14, 2007 · If there is a circuit with only one heating element, how do we calculate the power it requires? According to the physics formula P=V^2/R, whenever you increase the resistance, the power it requires falls. However, I don't think that's right. Or is it? When R is increased, so the heating element will

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Solved: In The Circuit Shown In (Figure 1), E = 21.0 V,R1

See the answer In the circuit shown in (Figure 1), E = 21.0 V, R 1 = 6.00 ?, R 3 = 12.0 ?, and R 2 can vary between 3.00 ? and 27.0 ? . a) For what value of R 2 is the power dissipated by heating element R 1 the greatest?

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How to calculate heat of exhaust gases from a gas engine ? Is

How to calculate heat of exhaust gases from a gas turbine ( i can understand that the values presented in equation are standard as i have mentioned reference too. but the higher heating value

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What is the R-value for earth, dirt, soil, backfill, or earth

I think the discussion of the R-value of soil and its relationship to heat loss and mass is an excellent one. However, I am still somewhat confused by the math on the actual R-value calculations for soil. If "one inch of 'insulation' (at R=3) is equal to two feet or more of soil," then R3 divided by 24" = R.125 per inch of soil, not 0.8 per inch.

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1.3 Fuel Oil Combustion

Water in the heat exchanger tubes is heated as it moves upward through the tubes. Cast iron boilers produce low pressure steam or hot water, and generally burn oil or natural gas. They are used primarily in the residential and commercial sectors. Another type of heat transfer configuration used on smaller boilers is the tubeless design. This

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For what value of R2 is the power dissipated by heating

For what value of R2 is the power dissipated by heating element R1 the greatest Question In the circuit shown in (Figure 1), E = 21.0 V, R 1 = 6.00 Ω, R 3 = 12.0 Ω, and R 2 can vary between 3.00 Ω and 27.0 Ω .

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resistors - Resistance of a heating element - Electrical

However, of the total energy dissipated by the circuit, the portion of the energy dissipated by each part is proportional to its resistance, so the resistance of the heating element has to be high enough so that most of the energy is dissipated by the heating element itself instead of, for example, the wiring in the walls.

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Heat sink - Wikipedia

A heat sink (also commonly spelled heatsink) is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant, where it is dissipated away from the device, thereby allowing regulation of the device's temperature at optimal levels.

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18.2 Heat Transfer From a Fin - MIT

A model configuration is shown in Figure 18.3.The fin is of length .The other parameters of the problem are indicated. The fluid has velocity and temperature .We assume (using the Reynolds analogy or other approach) that the heat transfer coefficient for the fin is known and has the value .

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Myths and methods for protecting boilers against flue gas

Nov 27, 2017 · To dissipate the 50,000 Btu/h added to the water by the boiler, the manifold station still requires 111.4° water at 5.5 gpm flow rate, and returns the same flow at 93°. The hot port of the mixing valve is again fully open, and passing all entering hot water directly to the manifold station. No mixing occurs in the mixing valve.

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Activity P47: Electrical Equivalent of Heat (Voltage Sensor

4. Record the 'Area' value as the electrical energy ('watt * s' or joules) used by the heating resistor. • Hint: In . DataStudio, the 'Area' value is in the Graph legend. 5. Calculate (in calories) the thermal energy (Q) absorbed by the water using . Q = mc. Δ. T, where . m. is the mass of the water, c. is the specific heat of water (1cal/g°C), and ∆ T

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Calculating heat dissipated in circuits (practice) | Khan Academy

Let's practice problems involving calculating the heat dissipated in electric circuits. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

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WHAT IS RMS (ROOT-MEAN-SQUARE) CURRENT? | Yahoo Answers

May 14, 2012 · a. the value of alternating current that gives the same heating effect that the corresponding value of direct current does b. an important measure of the current in ac circuit c. amount of direct current that would dissipate the same energy in a resistor as is dissipated by instantaneous alternating current over a complete cycle d. all of the above

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