Junior high school physical and electrical formula I, ohm's law part
1.I=U/R (ohm's law: the current in a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor).
2.I=I 1=I2=…=In (characteristics of current in series circuit: current is equal everywhere).
3.U=U 1+U2+…+Un (characteristics of voltage in series circuit: in series circuit, the total voltage is equal to the sum of voltages at both ends of each part of the circuit).
4.I=I 1+I2+…+In (characteristics of current in parallel circuit: the current on the main line is equal to the sum of currents in each branch).
5.U=U 1=U2=…=Un (characteristics of voltage in parallel circuit: the voltage at both ends of each branch is equal, which is equal to the power supply voltage).
6.R=R 1+R2+…+Rn (characteristics of resistors in series circuit: total resistance is equal to the sum of the resistances of all parts)
7.1/r =1/r1+1R2+…+1/rn (characteristics of resistors in parallel circuits: the reciprocal of the total resistance is equal to the sum of the reciprocal of all parallel resistances).
8.R and = R/n(n (formula for calculating total resistance when n identical resistors are connected in parallel)
9.R series = NR (formula for calculating total resistance when n identical resistors are connected in series)
10.u1:U2 = r1:R2 (the relationship between voltage and resistance in series circuit: the ratio of voltage is equal to the ratio of their corresponding resistances).
11.i1:i2 = r2: r1(the relationship between current and resistance in parallel circuit: the ratio of current is equal to the inverse ratio of their corresponding resistances).
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Junior high school physical and electrical formula 2, electric power part.
12.P=UI (experience, applicable to any circuit)
13.P=W/t (definition, applicable to any circuit)
14.Q=I2Rt (Joule's law, applicable to any circuit)
15.P=P 1+P2+…+Pn (applicable to any circuit)
16.W=UIt (empirical value, applicable to any circuit)
17.P=I2R (compound formula, only applicable to pure resistance circuits)
18.P=U2/R (compound formula, only applicable to pure resistance circuits)
19.W=Q (empirical formula, only applicable to pure resistance circuits, where w is the work done by current flowing through the conductor and q is the heat generated by current flowing through the conductor).
20.W=I2Rt (compound formula, only applicable to pure resistance circuit)
2 1.W=U2t/R (compound formula, only applicable to pure resistance circuits)
22. p1:p2 = u1:U2 = r1:R2 (the relationship between electric power and voltage and resistance in series circuit: in series circuit, the ratio of electric power is equal to the ratio of their corresponding voltage and resistance).
23. p1:p2 = I1:I2 = R2: r1(the relationship between electric power and current and resistance in parallel circuit: in parallel circuit, the ratio of electric power is equal to the ratio of their corresponding current and the inverse ratio of their corresponding resistance).
As an important part of physics, electricity not only occupies a large proportion in the senior high school entrance examination, but also is very important in the senior high school entrance examination. High-rise buildings need a good foundation. If children are not hindered by electricity in the senior high school entrance examination and senior high school entrance examination, they need to lay a good foundation and master the most basic knowledge and formulas from now on.
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