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electricity yr 9
movement of electron, circuits, conductors and insulators of electricity.
| Question | Answer |
|---|---|
| what is a circuit | a closed conducting pathway in which electrons flow toward the positive charge. |
| what is a dry cell | a battery with a paste eg. torch battery |
| What is a wet cell | A battery with a liquid eg. car battery ( more dangerous ) |
| what is a cell | something that uses chemical reactions to seperate changes + produce electric currents ( a battery ) |
| what is Electric conductor | material through which charged particles are able to move through. |
| what is electric insulator | a material that does not allow the movement of shared particles |
| what is a current | describes the flow of electrons around a certuit ( more current = more flow ) |
| Semi conductor | a material that is normally an insulator, but when combined with another substance it can become a conductor. |
| Where does a current move | a current moves from the negative terminal to the positive terminal |
| what is current measured by | current is measured by counting the number of electrons that pass a point in one second |
| what is current measured in | amps |
| what is current measured with | an ametre |
| as soon as you move 1 electron | all electrons move |
| do electrons move fast or slowly | slowly |
| what is voltage | is the measure of the What is residence amount of energy supplied to the charges by the electrons source (the supplier of the voltage eg. cell) |
| what is voltage measured in | volts (v) |
| what is a voltage measured by | Volter metres measure voltage in a parallel across a component. |
| What is Resistance | the measure of how difficult it is for an electric current to flow through a substance |
| What is resistance measured in | ohms |
| What is a thermistor | a thermistor is a type of resistor that is temperature dependant |
| what is potentiometre | a variable resistor |
| how easy electrons pass through an wire depends on | the type of metal the wire is made of, how long the wire is, how thick the wire is |
| what is a series circuit | where all components are connected one after another to forma single loop |
| if the circuit is broken and any point in a series circuit | no electrons can flow |
| what is a parallel circuit | has a number of branches has its own components, current leaving the battery splits and even amounts go down each branch. |
| what is ohms law | V=IxR |
| what does I stand for | current |
| What is a shorts circuit | a short circuit is when a current flows along a different pathway from the one intended( his causes a lot of heat and can cause a fire) |
| what is a fuse | a switch a thin bit of wire that burns up quickly when to much current flows through a circuit and stops the flow of electricity. |
| why is water with salt in it a good conductor | because there charges can move |
| when voltage from a parallel circuit go down two branches the current is? | split |
| what is voltage is connected in | parallel |
| what is current connected in | series |
| what is electricity | is a form of energy caused by the presence and flow of electric charges |
| what are atoms made of | protons, neutrons (in the nucleus), and electrons (around the outside in shells |
| what happen when two objects rub together | electrons are sometimes transferred from one objet to another |
| what can happen to neutrons if they gain or loose electrons | If they lose electrons the become positive, if they gain electrons they become negative |
| what is a electrostatic charge | is when a charge stays on an object with out moving. |
| what are some properties of electrostatics | like charges repel. unlike charges attract. charged objects attract neutral objects |
| how does a vain de Graaf work | works by rubbing a belt, which removes electrons from the surface of demeaned anything that touches it. |
| what happens to electric charges when they are separated | they have electrical energy and they try not to get back together again |
| where does a conventional current move | from the positive to the negative terminal |
| what are the three things a circuit must have | An energy source. An energy user. Wires to connect everything |
| what can voltage is also known as | a measure of the amount of energy used by the charges as they pass through a component such as a light bulb |
| what canvoltage can be known as | the potential difference |
| what does a high resistance mean | that electrons find it hard the pass through |
| in a series circuit what happens the charge/voltage | it is shared among the components because the current must pass through all components |
| what happens to batteries when they are in a series circuit | electrons pick up energy from both batteries ( so the voltage increases ) |
| what happens to batteries when they are connected in a parallel circuit | the electrons go through either one battery or the other, so they don't increase in voltage, but they last longer. |
Created by:
alexa.bell
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