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Junior high school physics when the voltage is fixed, there is such a problem in the relationship between current and resistance: a certain voltage, the measured data of current and resistance are as follows: a group of current 0.12 a, resistance 0.6 Ω; current 0.24 a, resistance 1.2 Ω; current 0.48 a, resistance 2.4 Ω. The problem is that one group of data is patchwork, which group is it? Please help to analyze, thank you
This group of data is wrong. The reason is that when we explore the relationship between current and resistance when the voltage is constant, we need to control the voltage unchanged. However, the data in the question shows that the voltage is obviously changing, which does not meet the requirements of the control reform
How to calculate the total power of series circuit and parallel circuit?
In parallel connection: the power of each electric appliance can be calculated separately and then added. That is p = P1 + P2 + P3 +. The total current (I = I1 + I2 + I3 +) can be calculated first, and then the total power can be calculated by formula P = UI, and the total resistance (1 / r = 1 / R1 + 1 / r2 + 1 / R3 +). Then the total power can be calculated by formula P = I * I * r or formula P = u * U / R
The relationship between electric power and resistance in series and parallel circuits
The current in the series circuit is equal everywhere, so according to P = I2R, the electric power in the series circuit is proportional to the resistance, and the voltage of each branch in the parallel circuit is equal, so according to P = U2 / R, the electric power in the parallel circuit is inversely proportional to the resistance
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