Electrical Circuits

• Microchips are used to control operations in an electrical circuits
• All circuits have the same properties
• When two cells join they form a battery
• In series circuit all components are arranged in a loop
• In series circuit current passes through all the components one after the other
• In parallel circuits two or more components are wired side by side
• In parallel circuits the current divides where the components are parallel
• Unit of current is ampere or amps
• Symbol of current is A
• If you add a second blub cell to a circuit the current increses
• The more current there is the brighter the lamps are
• If you add a lamp to a circuit the current the brightness of the lamp decreases
• The current flow is measured by an ammeter
• Ammeter is always connected in series
• The ability of a cell of drive current is measued by its voltage
• Unit of volatge is volts
• Symbol of voltage is V
• Voltage is the measure of electrostatic potential energy between two points
• Voltage is measured by a voltmeter
• Voltmeter can only occour in a parallel circuit
• The ability of a material to oppose the flow of electrons is called resistance
• Resistance produces heat
• First resistance was measured by observing lamps
• Scientists use the equation Resistance = Voltage/Current to find resistance
• Unit of resistance is ohms
• Each component in an electrical circuit have different resistance
• The higher the resistance the lower the current
• Resistors are used in circuits to maintain resistance
• Resistors are not effected by heat
• Variable resistors are resistors whose value of resistance can change on demad
• Buzzer is a device which vibrates when current passes through it
• Buzzer's vibration produces sound
• Superconductors are material which offer no resistance to current and the material is called superconductors