PHY152H1 Chapter Notes - Chapter 19: Series And Parallel Circuits, Internal Resistance, Electric Potential
Document Summary
Current: ow of charge per unit time current ows from + > - Electrons are negative so they ow from - to + Battery: chemical energy > electrical energy charges rearranged so that there are more + charges at the + end. Ow of electrons through metal give energy to metal atoms, causing temp of metal to increase. Ohm"s law: current owing through an ohmic conductor is directly proportional to the potential di erence across it, provided temp + physical conditions remain constant. Non-ohmic conductors e. g. light bulb light bulb gets hot > metal atoms vibrate more > more collisions between metal atoms + electrons > increase resistance. Electric currents emf: amount of chemical energy converted to electrical energy per unit charge (speci c to cells, batteries + generators) Potential di erence: amount of electrical energy converted to thermal energy per unit charge.
