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Unit 9 - Electricity
| Question | Answer |
|---|---|
| What is a negative charge caused by? | Excess electrons |
| What is a positive charge caused by? | A deficiency of electrons |
| What are the two types of materials? | Conductors and Insulators |
| What is the difference between conductors and insulators? | Conductors allow the flow of charge, inductors inhibit it |
| What does the word static mean? | Still or stationary |
| What is static electricity? | The buildup of charge on the surface of a insulating material |
| State the law of electrostatics. | Opposite charges attract and like charges repel |
| What are the three ways to build static electricity on an insulator? | Friction, induction, and conduction |
| Explain charging through friction. | Two neutral objects are rubbed against each other, scraping the electrons off of one and onto the other. One is charged negatively and the other positive, so they attract. |
| Explain charging through induction. | A charged object is brought near a neutral object, causing a temporary rearrangement of the charges in the neutral object |
| What is electric current? | The rate at which charge moves through the cross section of a conductor |
| Explain direct current. | The potential difference between two points is fixed, causing the charge to only travel in one direction. |
| Explain alternating current. | The source of potential difference keeps changing sign, so therefore the charge keeps changing direction. |
| If alternating current occurred slowly, what would you see? | Flickering |
| What is resistance? | Opposition to the motion of charge through a conductor. |
| What is voltage? | The energy difference between to points. |
| What pushes the electrons? | Voltage |
| What are ohms abbreviated by? | Ω an omega Ω |
| About how many nerve cells are in your brain? | 100 billion |
| What is the only thing nerve cells do? | Carry electricity |
| What are nerve cells wrapped in to insulate the electricity? | Fat |
| What is the gap in between your nerves called? | Synapse |
| What is a circuit? | The path charges follow. |
| What must a circuit do for electricity to flow? | Be closed, complete and connected to the voltage |
| What is a series circuit? | When a charge must go through every circuit element to get back to the circuit source. |
| What happens in a series circuit if one resistor breaks? | No electricity flows |
| If one goes out in a series circuit, what happens? | They all go out. |
| What is a parallel circuit? | When a charge can go through any circuit element to get back to the voltage source because there are several branches. |
| What happens in a parallel circuit if one resistor breaks? | The others stay functioning because they have their own branch of the circuit. |
| What are neurotransmitters? | Conductive chemicals that fill the gap (synapse) between nerves. |
| Different charges carry different types of what? | Charge |
| What are seizures? | Uncontrolled electrical signals in the brain which then send messages to the body. |
Created by:
cambie
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