Example image of eyePlorer eyePlorer map for 'Electric current': Electric charge Phenomenon Quantity Electrical conductor Electron Ion Plasma (physics) Wire Ampere International System of Units Ammeter Free electron model Solid Electric field George Gamow Battery (electricity) Direct current Voltage source Positive Charge carrier Coulomb Elementary charge Second Electric potential Vacuum Proton conductor Electrolyte Electrochemistry Electron hole Semiconductor Euclidean vector Square metre Gas Metal Copper Drift velocity Cathode ray tube Speed of light Electromagnetism Maxwell's equations Electric power transmission Electrical load Wave propagation speed Magnetic field Galvanometer Current clamp Current transformer Hall effect Rogowski coil Sensor