level: electricity
Questions and Answers List
level questions: electricity
| Question | Answer |
|---|---|
| what is charge | a property of a body which experiences a force in an electric field. |
| what is current | the rate of flow of charge |
| what is ac | the direction of the flow of electrons switches back and forth at regular intervals or cycles |
| dc | A direct current flows in only one direction |
| why is ac used for transformers | A transformer needs an alternating current that will create a changing magnetic field. A changing magnetic field also induces a changing voltage in a coil. |
| as resistance increases... | As resistance increases the current decreases. |
| as voltage increases | current increases |