The power of the equipment is standardized on the label of the equipment. Now you can calculate the desired result according to these formulas. 1, ohm's law:

I=U/R

U: voltage, v;

R: resistance, ω;

I: current, a;

2, the whole circuit ohm's law:

I=E/(R+r)

I: current, a;

E: electromotive force of power supply, v;

R: internal resistance of power supply, ω;

R: load resistance, ω

3, parallel circuit, the total current is equal to the sum of the currents on each resistor.

I=I 1+I2+…In

4, series circuit, the total current is equal to the current.

I=I 1=I2=I3=…=In

5. Power of the load

Pure resistance active power P=UI → P=I2R (where 2 is the square)

U: voltage, v;

I: current, a;

P: active power, w;

R: resistance

Pure inductance reactive power Q=I2*Xl (where 2 is square)

Q: reactive power, w;

Xl: inductance reactance, ω

I: current, a

Pure capacitor reactive power Q=I2*Xc (where 2 is square)

Q: reactive power, v;

Xc: capacitive reactance, ω

I: current, a

6. Electricity (electric energy)

W=UIt

W: electric work, j;

U: voltage, v;

I: current, a;

Time, seconds