May I ask the thermophysical formula q = u square / R T q = I square RT? Can these two formulas be used in series parallel circuits? How to use them

May I ask the thermophysical formula q = u square / R T q = I square RT? Can these two formulas be used in series parallel circuits? How to use them

It depends on what kind of circuit you are. For a section of circuit, whether it's a motor or something inside, or to make it clear that you cover the middle part of the circuit with a black box. You don't know what it is. In this way, the energy consumed in time t is u times I times t (assuming that the voltage and current do not change with time). Open the box, and if you find that it's just a resistance inside, No matter in series or in parallel or in hybrid, the total resistance can always be calculated according to a single resistance. According to Ohm's law, u = IR (R is the total resistance) and substituting it into the previous formula, naturally it is the two formulas you said. If there is anything else in it except resistance, such as motor, it is not a pure resistance circuit, Ohm's law does not hold, and the two formulas you said are wrong, According to u times I times t to calculate the total consumption of the computer, a considerable part of which is converted into mechanical energy, electrical energy into mechanical energy is naturally not simple Ohm's law can describe, as for why u times I times T represents the total electrical energy consumed by this circuit, you can refer to the introduction in electromagnetics, which will be involved in any electromagnetics book

Is there such a formula as R = u squared / P?

Yes, there are
P=UI
U = IR gives I = u / R or r = u / I
Bring in P = UI to get P = u ^ 2 / r = I ^ 2 * r
We can get r = u ^ 2 / P

Joule's law P = u * I w = u * I * t q = w = I square * r w = u square divided by R * t under what circumstances?
And P squared = I squared * r

P = u * I w = u * I * t can be used in any case;
The latter is only suitable for pure resistance circuit

Let me ask you a physics problem about the formula r equals the square ratio p of u?
Lights L1 and L2 are marked with "6V 6W" and "6V 3W" respectively. When the switch is closed, lights L1 and L2 can emit light. Then the ratio of the number indicated by a and B voltmeters is? (V A measures L2 voltage, v b measures total voltage)

The lamps L1 and L2 are marked with "6V 6W" and "6V 3W" respectively. It is easy to get R1 / r2 = 1 / 2 with u ^ 2 / R
When L1 and L2 are connected in series, U1 / U2 = R1 / r2 = 1 / 2 can be easily obtained by u = IR because I is equal
So V A / v b = 3 / 2

What does the physical formula P = UI mean?

This is the formula for calculating electric power. U is the voltage at both ends of a conductor and I is the current passing through the conductor
The theorem is the result of human long-term observation of the world. This is the rule. In physics, it is stipulated that a voltage multiplied by a current is a power, and the power is dead. The formula for calculating power is like this

Can the physical formula r = u ^ - p be used to calculate R × P under the voltage U = root sign

Yes

What is the ratio between height (H) and force (f) in the formula of physical buoyancy f = g h
Meat remains the same

The formula of buoyancy is f floating = P liquid GV row
Your formula is liquid pressure formula = P liquid depth
When the liquid density is constant, the farther the distance from the free surface to the studied point, the greater the pressure, that is, the deeper the depth, the greater the pressure

How to understand the slope formula FS = GH of physical work when f is greater than g and S = H,

S is the length of the inclined plane, is the hypotenuse of the right triangle, h is the height of the inclined plane, is the right side of the right triangle, the hypotenuse is always greater than the right side, it is impossible to appear s = H

What are FS and GH of W = FS and w = GH in physics

F is the force acting on the object, s is the displacement of the object in the direction of the force. Or s is the actual displacement, f is the force acting on the object in the direction of displacement. If the force and displacement are in the same direction, then the above situation still holds, and W is the work done by the force on the object
Where w = GH, G is the gravity of the object, h is the height of the object falling or rising, and W is the work done by gravity on the object

S and H differences between w = GH and w = FS in Physics

In physics, w = GH is generally used to calculate the work done by gravity, that is, the change of gravitational potential energy, h is the change of the front and back height of the object, while the formula w = FS is generally used to calculate the work done by force, and S is the distance of moving in the direction of force