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Electricity UnitTest
Electricity Unit Test
| Question | Answer |
|---|---|
| The ability to do work or to cause a change. The ability to make things move. | Energy |
| Energy of vibration of particles within matter. The faster the particles vibrate, the more energy they have. | Thermal energy |
| Light, microwaves, x-rays. Moves in Waves. Can move through space | Electromagnetic Energy |
| Energy produced when an object is made to vibrate; travels out as waves in all directions. Has to travel through some sort of matter. | Sound energy |
| Energy stored in the bonds of molecules. | Chemical energy |
| Energy that holds protons & neutrons together in the nucleus of an atom. (Powers the sun) | Nuclear Energy |
| Energy can not be created or destroyed. It can be converted from one form to another, but the total amount of energy stays the same. | Law of Conservation of Energy |
| Energy produced by the movement of electrons through a substance | Electrical Energy |
| Broad Category for the energy of moving things | Kinetic energy |
| The energy of moving things – energy of an object in motion | Mechanical Energy |
| true or false: Energy takes up space and has mass. | false |
| true or false: Only things that are moving have energy | false |
| In any physical or chemical process, what two total quantities are always conserved? | matter and energy |
| Which of the following best represents the major energy conversion that takes place when using a washing machine? | electrical -> mechanical |
| When Cody turns on a flashlight, chemical energy from the battery is converted into _____ energy | electromagnetic |
| An apple tree converts ________ energy from the sun into chemical energy. | electromagnetic |
| Nuclear and thermal are two types of ________, which is the ability to do work or cause a change. | energy |
| true or false: Electric charges that are different attract each other. | true |
| The charge on a proton is | positive, and the charge on an electron is negative |
| A complete, unbroken path through which electric charges can flow is a(n) | electric circuit |
| The continuous flow of charges through a material is called electric ____________________. | current |
| Materials that allow the charges of an electric current to move freely through them are called | conductors |
| A(n) ____________________ is a material in which charges cannot flow easily. | insulator |
| The ampere is a unit of | electric current |
| An example of an insulator is | rubber, glass |
| What causes charges to move in a circuit? | voltage |
| An electric current will always follow | the path of least resistance |
| True or false: Batteries and generators are examples of voltage sources, which create a potential difference in a circuit. | true |
| If two wires of the same material have the same thickness but different lengths, the _________ wire will have a greater resistance | longer |
| True or false: For a constant voltage, increasing the resistance will cause the current to decrease. | true |
| True or false: For a constant voltage, increasing the resistance will cause the current to decrease. | true |
| true or false: The unit of measure of voltage is the ohm | false |
| true or false: As the temperature of most conductors increases, the resistance decreases. | false |
| An increase in voltage causes a greater electric ____________________ in a circuit. | current |
| According to Ohm’s law, resistance is equal to voltage divided by | current |
| A device that transforms stored chemical energy into electrical energy is a(n) | electrochemical cell |
| What parts of the cell are used to connect an electrochemical cell to a circuit? | terminals |
| A device used to open and close an electric circuit is a(n) | switch |
| true or false: In a circuit diagram, a zigzag line drawn inside a circle represents a type of switch | false: that would be a resister |
| A device to measure electrical potential energy difference, or voltage, is called a(n) | voltmeter |
| In a series circuit with three bulbs, adding another bulb will | make all the bulbs dimmer. |
| To measure the current through a device in an electric circuit, a(n) ____________________ should be connected in series with the device. | ammeter |
| True or false: In a parallel circuit, there is only one path for current to take | false |
| In a(n) ____________________ circuit, different parts of the circuit are on separate branches. | parallel circuit |
| A connection that allows current to take the path of least resistance is called a | short circuit |
Created by:
stacylatham
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