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SNC1DI Electricity
Grade 9 Science Electricity
| Question | Answer |
|---|---|
| voltmeter | measures the electric potential between two points in a ciruit |
| wall outlet | Brings electrical energy in from the community power supply |
| switch | Can be opened to stop current flow or closed to allow current to flow |
| resistor | A device that slows down the flow of electrons in conductors |
| motor | Converts electrical energy into motion |
| light bulb | Converts electrical energy into light and heat |
| ground | Connects the circuit to the earth |
| fuse | Prevents too much current from flowing through the circuit |
| cell | Source of current. Long bar represents the positive terminal. |
| battery | One,two or more cells joined together. This _______ is made up of 3 cells. |
| ammeter | Measures the amount of electric current flowing in a circuit. |
| Like charges | Charges that will repel |
| Unlike charge | Charges that will attract |
| Static electricity | The buildup of charges on an object which do not flow |
| Friction | The transfer of electrons from one object to another by rubbing |
| Conduction | The tranfer of electrons from one object to another by direct contact |
| Law of conservation of charge | Electrons are not created or destroyed they are only transferred from one location to another |
| Static cling | Static electricity that causes clothes to stick together and is what enables plastic wrap to cling |
| Static discharge | The loss of static electricity as electric charges move off an object |
| Lightning | a discharge of static electricity between clouds and the earth |
| Pith Ball | A ball on a string used to detect static charge |
| Potential difference | The difference in electrical potential between two places which pushes charge through a circuit |
| Voltage | Another name for the potential difference, measured by a voltmeter |
| Volt | The unit of measure for the potential difference |
| Batteries and generators | Voltage sources |
| Resistance | The opposition to the movement of electric charges flowing through a material |
| Ammeter | An instrument used to measure current |
| Amps | The unit used to measure current |
| Ohm's Law | This Law states that resistance is equal to the voltage divided by the current |
| Series circuit | An electric circuit with a single path |
| Parallel circuit | An electric circuit with multiple paths |
| Short circuit | An unintended path that allows current to follow a low resistance causing large current. |
| Conductor | A material through which electrons move freely, forming an electric current |
| Electric circuit | A complete path through which electric charges can flow |
| Electric current | The flow of electric charges through a material |
| Grounded | Allowing charges to flow directly from the circuit to the ground connection |
| Insulator | A material through which the charges of an electric current are not able to move |
| Third prong of an appliance plug | Part of a plug which connects the metal shell of an appliance to the safety grounding wire of a building |
| Van de Graaff generator | a device which produces static electricity using a rubberband like belt |
| Lightning rod | A metal rod mounted on the roof of a building in order to protect a building |
| circuit breaker | A reusable device added to a circuit to prevent overheating |
| Ohm | The unit of measure for resistance |
| electricity | form of energy which can travel along conductors |
| charged particles | particles that carry electricity |
| matter | either solid, liquid or gas, that which has mass and occupies space |
| atoms | extremely small particles which all matter is made up of |
| electrons | negatively charged particles which orbit the nucleus of an atom |
| neutrons | neutrally charged particles which are contained in the nucleus of the atom |
| protons | positively charged particles which are contained in the nucleus of the atom |
| nucleus | central core of an atom containing protons and neutrons |
| conductors | objects that electricity is allowed to pass through |
| insulators | objects that do not allow electrons to travel through |
| negatively charged | objects that have gained electrons making them... _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| positively charged | objects that have lost electrons making them _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ |
| circuit | complete conducting loop where all components are linked together |
| free electrons | electrons which are able to to transfer through a substance |
| circuit diagram | simple way of drawing electrical circuits |
| terminal | point of attachment for wires to a battery or meter |
| current | the flow of electrons around a conducting circuit |
| power source | an item such as a battery, electric supply or the wall socket |
| components | objects which are part of an electrical circuit, lamp, battery, resistor etc |
| load | object which converts electrical energy into other forms |
| alternating current | current that keeps changing direction |
| direct current | current which travels in one direction only |
| volt | unit of voltage gain or loss |
| ammeter | meter used to measure the size of a current |
| voltmeter | meter used to measure the gain or loss of voltage |
| fuse | a thin wire which melts if the current is too large, not reusable |
| resistance | property which makes it hard for electrons to pass |
| resistor | a component used to limit the current in a branch/part of a circuit |
| voltage | the amount of push on the charge in a circuit (or energy per unit charge) |
| power | total amount of energy supplied or used per second |
| watt | unit of power |
| What happens when you heat a substance? | The particles receive more energy and are able to move faster |
| We use energy in many ways. Cooking food, lighting homes, etc. Energy always changes from one form to another and some always changes into ________ energy. | heat energy |
| Give an example of wasted energy. | When turning on a lamp, it produces light and heat. The heat energy is wasted energy. |
| Many substances are burned to release their chemical energy to provide heat and light. They are called fuels. Name at least 3. | wood, coal, gas, charcoal, oil, diesel oil, petrol, natural gas, and wax |
| Give two examples of things that contain chemical stored energy. | food & fuels |
| Name three alternative sources of electric energy to fossil fuels. | geothermal energy, wind power, solar power, hydroelectricity |
| Nonrenewable Energy Source | energy source that cannot be restored for human use, such as fossil fuels |
| Renewable Energy Source | energy source that is being replenished, even as it is being consumed- solar energy, geothermal energy, wind energy, and hydropower are examples |
| Geothermal Energy | energy derived from heat under the Earth's surface |
| Hydropower | energy from falling or moving water |
Created by:
marcarli
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