# Illustration Electric force on a charge in a plate capacitor

A plate capacitor consists of two electrically charged plates (electrodes) One plate is positively charged with the charge $$+Q$$ and the other plate is negatively charged with the charge $$-Q$$. This charge difference on the plates is characterized by the electric voltage $$U$$.
If, for example, a positive test charge $$q$$ is placed between the two plates, the charge experiences an electrical force $$F$$ towards the negative plate.