Is there any contradiction between electric work formula and electric heating formula Electric work formula: w = uit Electrothermal formula: q = I & # 178; RT For the pure resistance circuit, all the electric energy is converted into heat energy, w = Q For the non pure resistance circuit, part of the electric energy is converted into heat energy, w > Q According to Ohm's law, I = u / R, w = uit = u & # 178; t / R, q = I & # 178; RT = u & # 178; t / R, w = Q So how does w > Q come from? Is Ohm's law invalid for non pure resistance circuit?

Your above understanding is correct. The key problem you don't understand is that Ohm's law can be used only when the circuit is pure resistance. Only when the circuit is pure resistance, can it be: w = uit = u & # 178; t / R, q = I & # 178; RT = u & # 178; t / R, so w = Q. otherwise, there is no later relationship
1. If we don't put in the resistance, we can't find the power
2. If the voltage of a motor is u, the current is I, and the internal resistance of the motor winding is r, then the electric work is w = uitand the heat generated is q = I ^ 2rt
The voltage U is not the voltage on the resistance, but the total voltage. The voltage on the internal resistance is only a small part of U. therefore, q = u ^ 2 / R * t cannot be used to calculate the heat. In this case, the relationship can be obtained from the energy conversion: W electricity = q + W output
Hehe Hello, according to the definition of electric work, the product of the moving charge and the potential difference is w, so this is never changed. However, in the non pure resistance circuit, the voltage at both ends of the resistance inside the motor is not u, but a part of u, so theoretically, electrothermal power is smaller than electric power
W> Q is derived from energy relations,
It is often emphasized that Ohm's law is invalid for non pure resistance circuit.
Sixth grade math oral 50 urgent!
On the left side of the fractional line is the denominator * multiplication sign 2 / 1 * 2 = 1 3 / 1 * 3 = 1 3 / 2 * 3 = 2 3 / 1 * 6 = 2 4 / 3 * 8 = 6 5 / 3 * 20 = 12 7 / 3 * 14 = 6 8 / 7 * 40 = 35 4 / 3 * 16 = 12 9 / 5 * 27 = 15 2 / 1 * 30 = 15 12 / 7 * 24 = 14 30 / 1 * 30 = 1 51 / 9 * 102 = 18 19 / 9 * 76 = 36 4 / 9 * 8 = 18 5 / 8 * 90 = 144 99 / 98 * 99 = 98 3
/It's the fractional line, the denominator on the left * the multiplier
2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2
4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35
4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14
30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18
5 / 8 * 90... Unfold
/It's the fractional line, the denominator on the left * the multiplier
2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2
4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35
4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14
30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18
5/8*90=144 99/98*99=98 3/14*6=28 7/1*28=4
10/1*90=9 5/3*105=63 19/7*38=14 5/1*25=5
8/19*16=38 61/60*122=120 7/2*28=8 6/1*48=8
9 / 7 * 18 = 14 25 / 7 * 100 = 28 9 / 5 * 81 = 45 8 / 9 * 16 = 18 8
Question
It is known that SN is the sum of the first n terms of the arithmetic sequence {an}. If A2: A4 = 7:6, then S7: S3 is equal to______ .
From A2: A4 = 7:6, a1 + DA1 + 3D = 76, that is, A1 = - 15d, then S7: S3 = 7a1 + 7 × 62d3a1 + 3 × 22d = − 7 × 15d + 21d − 3 × 15d + 3D = − 84d − 42d = 2:1, so the answer is 2:1
Why is the formula of electric work and electric heat the same
In some cases, electric work is not equal to electric heat, and the formula of electric work and electric heat is the same, q = L & # 178; RT w = uit. These two formulas can be deduced from each other, and the results are always the same. Isn't electric work always equal to electric heat?
In some cases, electric work is not equal to electric heating (when electric energy is only converted into internal energy, electric work is equal to electric heating),
You should note that the formula of electric work and electric heat is different: electric work is w = uit, electric heat is q = L & # 178; RT,
The two formulas are conditional on each other: in pure resistance circuit
If the circuit is not a pure resistance circuit, electric work is not equal to electric heat, but greater than electric heat, because electric work is converted into other forms of energy besides electric heat
Transformation between work and energy
Pure resistance circuit, electric power is converted into electric heating
The problems and answers of oral math in Volume 2 of grade 6
It is known that the sum of the first n terms of the arithmetic sequence {an} is Sn, and satisfies A2 + A4 = 14, S7 = 70
Let BN = (2Sn + 48) / N, find out the minimum term of BN and the value of the term
an=a1+(n-1)da2+a4=142a1+4d =14a1+2d =7 (1)S7=70(a1+3d)7 =70a1+3d =10 (2)(2)-(1)d=3a1=1an = 1+(n-1)3 = 3n-2bn = (2Sn+48)/n= [(3n-1)n+48]/n= (3n^2-n+48)/nletf(x) = (3x^2-x+48)/xf'(x) = 3- 48/x^2 =03x^2-...
Calculation formula, unit and symbol of electric work
Because w = Pt = uit = UQ = I ^ 2rt = (u ^ 2) t / R, physical quantity symbol: P = w / T = UI = UQ / T, name: electric power = electric work / time = voltage, current = voltage, electric quantity / time, main unit: w = w = J / S = v a = VC / s, main unit name: Watt = Joule / S = volt ampere = volt Coulomb / s
Can it solve your problem?
The final examination paper of the first volume of the sixth grade
And so on and so forth
Five Minutes,
I'll give you 100 points. Please,
Because I failed in the exam, the teacher told me to copy it five times, and didn't give me the paper
Grade 6 mathematics final comprehensive exercise paper class: Name: student number: Score: 1. Fill in the blank: (12 points) 1. Kilogram = () gram, 40 points = () when the reciprocal of 2 and 2 is (), () and 0.75 are reciprocal each other. 3. 16 meters is () meters, more than 50% than 40 (), 20% of 250 is (). 4, = (): 40 =
Let Sn be the sum of the first n terms of the arithmetic sequence {an}, if S7 = 35, then A4=______ .
So the answer is 5
Is the unit of electric work formula w = uit. T hour or second
hour
second
Question: what is the time in ten minutes

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