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Anonymous users2024-02-06The full formula of junior high school physics can be referred to below.
1. Thermal formula:
C water 1, endothermy: Q absorbs cm(t t0) cmδt.
2. Exothermic: Q emitting cm(T0 t) cmδT.
3. Calorific value: q q m.
4. Efficiency of furnace and heat engine: q effective use of fuel.
5. Thermal equilibrium equation: q release and q absorption.
6. Thermodynamic temperature: t t 273k.
7. Fuel combustion exothermic formula Q absorption MQ or Q absorption VQ (applicable to natural gas, etc.).
2. Ohm's Law Formula:
1. i=u r (Ohm's law: the current in the conductor is proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor).
2、i=i1=i2=…=in (the characteristic of the current in the series circuit: the current is equal everywhere).
3、u=u1+u2+…+UN (characteristics of voltage in series circuits: in series circuits, the total voltage is equal to the sum of the voltages at both ends of each part of the circuit).
4、i=i1+i2+…+in (characteristic of the current in parallel circuits: the current on the dry circuit is equal to the sum of the currents of each branch).
5、u=u1=u2=…=un(Characteristics of voltage in parallel circuits: The voltage at both ends of each branch is equal. The beam is equal to the supply voltage).
6、r=r1+r2+…+rn (characteristic of resistance in series circuits: the total resistance is equal to the sum of the resistances of the circuit parts).
r=1/r1+1/r2+…+1 rn (characteristic of resistors in parallel circuits: the reciprocal of the total resistors is equal to the sum of the reciprocals of the various parallel resistors).
8. r and = r n (the formula for finding the total resistance when n of the same resistance in parallel).
9. r string = nr (the formula for finding the total resistance when n of the same resistance are connected in series).
10. U1:U2=R1:R2 (the relationship between voltage and resistance in series circuits: the ratio of voltage is equal to the ratio of resistance corresponding to them).
11. i1:i2=r2:r1 (the relationship between current and resistance in parallel circuits: the ratio of current is equal to the inverse ratio of their corresponding resistance).
3. Summary of physical quantity formulas:
1. Speed of light: c 3 108m s (in vacuum).
2. Sound speed: V 340m s (15).
3. The human ear distinguishes echoes: .
4. Gravitational acceleration: g.
5. Standard atmospheric pressure value: 760 mm mercury column height.
6. Density of water:
7. Freezing point of water: 0.
8. The boiling point of water: 100.
9. Specific heat capacity of water: c Lack of slag.
10. Elemental charge: e.
11. Voltage of a dry battery:
12. Voltage of a lead-acid battery: 2V. Fuci.
13. Safe voltage for human body: 36V (not higher than 36V).
14. The voltage of the power circuit: 380V.
15. Home circuit voltage: 220V.
16. Unit conversion: (1) 1m s.
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Anonymous users2024-02-05You give a good review.
Physical Quantity (Unit) Formula Note Deformation of the formula.
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