Please briefly talk about the relationship between current, resistance, voltage and electric energy.

Voltage v

Resistance r

Electric work (i.e. electric energy) w

Time t

I=V/R

The resistance r is determined by the material, cross-sectional area and length of the conductor. In an ideal state, R is constant, so the greater the voltage V, the greater the current I. In the case of constant R, the voltage V can definitely determine the current I..

W=I？ Rt=U？ t/R

=IUt

Electric power is determined by resistance, voltage and service time.

The first question: I don't know what you want to ask, so I don't know how to answer it.

The second problem: the current is determined by electric energy, resistance and service time, not electric energy. Large current and small resistance. If you use 1ns, there is no electricity. Do you think the electricity is big? From W=I? Rt can be deduced.

The third question: this has not been studied.

The fourth question: Is the voltage drop due to the decrease of electric energy, from W=U? The formula of t/R can be deduced. Obviously, if you change a bulb with a higher resistance, you will find it darker.

In the final analysis, the current is not how much, but the size. It is the magnitude of the directional motion of the charge. If you ask how much, I can only answer that the current is determined by the resistive material, cross-sectional area and length.