Electric Current. Objectives: . State the definition of electric current, ; State the definition of electric resistance, ; Appreciate that metallic conductors at a constant temperature satisfy Ohm’s law, ;
The electrons increase their kinetic energy as they move through the metal but soon they will suffer inelastic collisions with the atoms of the material, which means they will lose energy to the atoms. The electric field will accelerate the electrons again until the next collision. This process repeats, causing the atoms of the material to vibrate with their gained energy (from the electron collisions), which shows up macroscopically as the increased temperature of the material.
A light bulb rated as 60 W at 220 V has a potential difference of 110 V across its ends. Find the power dissipated in this light bulb.