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Science Ch8
Electrical energy
| Question | Answer |
|---|---|
| What is static electricty? | The build up of charge on a object(when things rub together) |
| What is the release of build up charge called? | Discharge |
| Explain the difference between static electricity and current electricity. | Static electricity has no movement, whereas current electricity does. |
| What is the purpose of a switch? | It opens and closes the gap in a curcuit which controls if the electricty flows through |
| What is an ammeter and what does it measure? | a device used to measure the amount of current in a curcuit. (Amps) |
| What is electricity? | A form of energy resulting from charged particles such as electrons and protons. |
| What is conductor? | A material that allows electricity to flow throgh it. |
| What is an insulator? | A material that does not allow electricity to flow through it. |
| Give 3 examples of conductors. | 1. Metal 2. copper 3. salt water |
| Give 3 examples of insulators. | 1. Plastic 2. air 3. wood |
| What is a closed circuit? | A complete curcuit with no gaps. |
| What part of a light globe glows to produce light? | The filament |
| From which terminal of a battery are electrons forced out? | the negative terminal. |
| What does a voltage measure? | How much energy the battery gives the electrons to move them around te curcuit. |
| What is the purpose of the plastic covering around the electrical cords? | To stop electrons from flowing through a circuit so it doesn't give an electric shock. |
| Why are metals better conductors of electricy then non-metals? | They contain free electrons which makes it easier for the electrons to pass through it. |
| What is a series circuit? | A circuit that has one path and is in a continuous loop. the electrons wont pass through the rest of the path. |
| What is current? | A measure of the number of electrons passing through a circuit. |
| What is a voltmeter? | A device used to measure the amount of energy used by a component in a circuit. Voltmeters are placed in parallel with the components they are measuring. |
| To which terminal of a battery should the positive terminal be connected? | The negative terminal. |
| What is voltage? | A measure of the amount of energy used in a circuit |
| What is a parallel circuit? | A circuit that has more then one path for elecrticity to flow through it. If one path has a break/gap the electrons still pass through the other paths. |
| Why are the appliances in houses and other buildings connected in parallel? | When one light is broken or one switch is open, the electrons still travel to the other globes and produce light. No matter how many branches are added to a parrallel circuit the brightness of each identical globe is the same. |
| Describe a disadvantage of parallel circuits. | If all the globes aren't identical, they don't glow the same amount. |
| What do numbers printed on a globe refer to? Eg. 80W | (80 Watts) It tells us how quickly the globe uses energy. |
| Why does a 70W globe glow more brightly than a 60W globe even though each electron passing through them received the same amount of energy? | It uses the electrons quicker. |
| Describe how the brightness of a globe is affected by the voltage. | The more volts, the brighter it glows. |
| Describe how the brightness of a globe is affected by current. | The more current, the brighter the globe. |
| What is the difference between a cell and a battery? | A battery is made up of two cells. |
| What are the 3 main parts of a battery? | The positive terminal, negatuve terminal and chemical paste |
| Why is the carbon separated from chemical paste in a battery? | If they were not separated, the electrons would go straight to the carbon and not through the external circuit. |
| Why doesn't a car battery last forever, if it is constantly being recharged? | The products of the chemical reactions inside the battery build up, stopping it from recharging properly. |
| What is correct -9V battery or -9V cell ? | 9V battery because cells are inside battery. |
| Does gaining electrons make an object negatively charged or positively charged? | Negatively chared. |
| Do like charges attract or repel eachother? | Attract. |
| Do opposite charges attract or repel eachother? | Repel. |
| Does losing electrons make an object negatively charged or positively charged? | Positively charged. |
| Is copper a conductor or insulator? | Conductor. |
| Is plastic a conductor or insulator? | Insulator. |
| Is steel a conductor or insulator? | Conductor. |
| Is air a conductor or insulator? | Insulator. |
| Is wood a conductor or insulator? | Insulator. |
| Is salt water a conductor or insulator? | Conductor. |
| What is the terminal of the battery that electrons return to? | Positive terminal. |
| What is a safety device that opens a circuit when too much current passes through it? | Circuit breaker. |
| What is the sensation felt when skin comes into contact with electricity? | An electric shock. |
| A circuit does not work if the switch is..... | open. |
| Type of energy resource from the sun, wind or water.... | renewable. |
| Type of energy resource that can only be used once... | Non-renewable e.g. gas, oil and coal. |
| Type of switch that opens a curcuit if it detects current leakage... | safety switch. |
Created by:
beckarr99
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