electricity

• in parallel current is the shared between component , voltage is the same between components
• in series current is the same across all components but voltage is shared
• current is the rate of flow of charges
• voltage is the amount of joules given to each coulomb of charge
• variable resistors vary the resistance needed - by increasing the wires length you increase resistance
• fuses heat up and break when current across is to high this protects the component its in series with
• conductors allow the flow of electrons to pass through them
• insulators have no free electrons and are not conductors of electricity
• electrical current is the electrical charge transferred per unit time
• ac. a.c. alternating current, current that reverses direction at regular intervals
• dc. direct current, electrons flowing in one direction,
• ac measured on mains -230v and generators
• dc. measured on cells and batteries
• potential differance is the energy provided by the supply to the charge