Formula Electrical Energy Voltage Electric current Time
$$W ~=~ U \, I \, t$$ $$W ~=~ U \, I \, t$$ $$U ~=~ \frac{W}{I \, t}$$ $$I ~=~ \frac{W}{U \, t}$$ $$t ~=~ \frac{W}{I \, U}$$
Electrical energy
$$ W $$ Unit $$ \mathrm{J} $$ Electrical energy that a charge carrier gains or loses when it traverses the voltage \(U\). A positive charge moving parallel to the electric field lines would gain energy, while a positive charge moving antiparallel to the field lines would lose the energy.
Voltage
$$ U $$ Unit $$ \mathrm{V} $$ The electrical voltage indicates how large the potential difference between two points is. Thus, the voltage indicates how much energy a charge carrier gains or loses when it travels the path between two points.
Electric current
$$ I $$ Unit $$ \mathrm{A} $$ Electric current is the charge transported within a certain time due to the applied voltage.
Time
$$ t $$ Unit $$ \mathrm{s} $$ Time within which the current \(I\) has flowed.