We need to be more detailed in some aspects, such as mechanical work, mechanical efficiency and so on,

We need to be more detailed in some aspects, such as mechanical work, mechanical efficiency and so on,

Chapter 11: let's get the deformation formula of ρ = m / V by ourselves
Chapter 12: v = s / T, average speed calculation, if the distance is equal, v = 2v1v2 / (V1 + V2), if the time is equal, v = (V1 + V2) / 2
Chapter 13: g = mg = ρ VG
Chapter 14: P = f / s, f = g, P = g / S = mg / S = PVG / S = ρ SHG / S = ρ GH
F floating = ρ liquid GV row = g row = m row g,
Chapter 15: w you = GH, w total = FS, s = NH, so: η = w you / W total = GH / Fs = GH / FNH = g / NF
And because f = (G + G motion) / N, so: η = g / NF = g / (G + G motion)

When does sliding rheostat consume the most power in the circuit?
The sliding rheostat is connected in series with a constant resistance in the circuit. When the sliding rheostat is changed to half of the resistance, the power consumption is the largest!

The power of the rheostat: P = I ^ 2 * r '= (U / (R + R')) ^ 2 * r '= (u ^ 2 * r') / (R + R ') ^ 2 = (u ^ 2 * r') / (R ^ 2 + 2R * r '+ R' ^ 2) = u ^ 2 / {(R ^ 2 / R ') + 2R + R'}, where the numerator u ^ 2 remains unchanged and the product of denominator "(R ^ 2 / R ')" and "R'"

When a constant resistance is connected in series with a sliding rheostat, the sliding rheostat has the maximum power

Setting resistance is R1, electric power is P1. Sliding rheostat is R2. Sliding rheostat connecting resistance is Rx. Electric power is px. Power supply voltage is u, circuit current is I. total power is p. then: PX = p-p1 = u * U / (R1 + Rx) - [U / (R1 + RX)] * [U / (R1 + Rx)] * R1 if 1 / (R1 + Rx) = x, the above formula can be simplified as: PX = u * u (- R1 * x)

The power consumption of the sliding rheostat decreases with the increase of the structure of the sliding rheostat

If you want to connect the four corners well, it's actually three connectors. The top metal rod is the same as any connector. In this way, you mainly look at the two connectors below. You should watch the circuit, connect it in series, and then connect it to the circuit. If you have any questions, please send me a message