electricity Flashcards
what is an electric current
an electric current is the flow of electricity through a medium
how is current meausred
ammeters
why does the current reading change as you increase the number of cells
because the electric current is stronger and faster
why does a torch light up when you turn on a switch
because the battery in the circuit provides energy. The battery helps push the electric current through the circuit. When we turn on a switch, it provides a passage way for the current to flow through.
what is potential difference
the push provided by cells to make the circuit move
if you kept on adding bulbs to a series circuit, what would happen to the current
the current would move more slowly as the bulbs take more energy
how do we measure potential difference
voltmeter
how is a voltmeter connected to a circuit
parallel
an aa battery is labelled ‘1.2’ describe what this means
the 1.2v on the aa battery indicates that the average voltage that the battery provides in 1.2 volts
suggest two advantages of connecting bulbs in a parallel circuit
- if one breaks the other stays lit
- you can control each lamp by adding a switch to each branch
what is the main difference between series and parallel
series circuit only has one pathway and the parallel circuit has two or more pathways
what component can make an object move
a buzzer
why would a balloon attract to a jersey when it is rubbed against the jersey
this happens because when you rub two objects together there us a shift of electrons due to the force. The balloon becomes negatively charged while the jersey becomes positively charged. When this attraction happens it is called an electrostatic force.
what is an insulator
an insulator is an object that doesn’t allow electricity to flow through it
