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Electricity &Magnets
A review stack for electricity and magnetism.
| Question | Answer |
|---|---|
| 3 ways to increase the strength of an electromagnet | 1. Add more coils; 2. iron core; 3. increase voltage |
| According to Ohm's Law, you would... | divide voltage by current |
| In a step-up transformer, are there more coils in the primary or secondary coil? | secondary |
| What do an ammeter and galvanometer measure? | current |
| True or False--Transformers can only work with alternating current. | True |
| Which of the following is a good insulator--a penny, a plastic rod, steel wool or copper? | plastic rod |
| True or False--There is a third prong on plugs to protect your appliance from a short circuit. | True |
| True or False--Batteries are made up of electrochemical cells. | True |
| What would happen if you put a compass near the north end of a magnet? | The needle points to the magnetic north |
| What is made up of one or more cells? | a battery |
| What ia another name for potential difference? | voltage |
| What is resistance measured in? | ohms |
| True or False--Circuit breakers, fuses and ammeters are always wired in series? | True |
| What happens when more bulbs are added to a series circuit? | the bulbs get dimmer |
| What are aligned in a magnet? | the domains |
| True or False--One way to make a magnet is to stroke a ferromagnetic material with a magnet in both directions. | False |
| Three ways to strengthen an electromagnet are to increase the amout of ferromagnetic material, use another cell and __________ | add more coils |
| What instrument should you use to measure a tiny amout of current? | galvanometer |
| Electrons flow from the ____________ to ______________. | negative to positive |
| What is current that travels back and forth called? | alternating current |
| What does a switch do to a circuit? | controls the flow |
| What is true about an ammeter reading in the beginning, middle and end of a series circuit? | They are all the same |
| What does it tell you about the type of circuit you have, when on a certain strand of light bulbs, when one goes out, they all go out? | It's a series circuit |
| What is a step-up transformer? | one that increases voltage and decreases current |
| What is a step down transformer? | one that decreases voltage and increases current |
| Which kind of current will work in a transformer--alternating or direct? | alternating |
| Atoms are normally neutral and have an equal number of protons and ____________. | electrons |
| True or False--Conduction happens by direct contact. | True |
| What kind of charge does an object tha is charged by conduction have? | the same as the object which charged it |
| What is it called when an object is charged by the transfer of electrons from another object by rubbing? | friction |
| What is a complete path through which electrons can flow? | a closed circuit |
| Which of the following explains why a charged balloon is attracted to a wall?--conduction, induction or friction | induction |
| Why does your hair stand on end when you touch a Van de Graaf generator? | like charges repel |
| True or False--Glass and rubber are good conductors. | False |
| What is the rate at which electrons flow through a circuit called? | current or amperage |
| True or False--In a series circuit, the amperage (current) is the same in all parts of the circuit. | True |
Created by:
smhamilton
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