What's the formula for electric energy? We need to deduce it. We need to know all about it,

What's the formula for electric energy? We need to deduce it. We need to know all about it,

R＝U/I U＝IR I＝U/R
P＝UI
P＝UI＝U（U/R）＝U²/R
P＝UI＝（IR）I＝I²/R
W＝Pt＝UIt＝U²t/R＝I²Rt
I = q / T
These are the only ones in junior high school

Derivation of resistance formula in grade two
All the formulas about resistance (including series and parallel) are derived
Eager for

Ohm's Law: Formula: I = u / r u = IR r = u / I the current intensity in a conductor is directly proportional to the voltage at both ends of the conductor and inversely proportional to the resistance of the conductor. The resistance of the conductor r = u / I. for a certain conductor, if the voltage changes, the current also changes, but the resistance value remains unchanged

Derivation of resistance parallel formula
How to deduce?

Suppose three resistors are in parallel
I=I1+I2+I3
U=U1=U2=U3
The above formula is divided by the following formula
I/U=I1/U1+I2/U2+I3/U3
That is, 1 / r = 1 / R1 + 1 / r2 + 1 / R3
If two resistors are in parallel
1/R=1/R1+1/R2
=(R1+R2)/R1R2
So r = r1r2 / R1 + R2

What we call mechanical power is expressed as

Mechanical power is the work done by the machine in unit time, and the formula is p = w / T