# Electricity EOCT Review #4

## 72 terms

### ammeter (to measure the amount of Amps passing through the circuit.)

What is this? (What is its purpose?)

### Battery (voltage source)

What is this? (What is it also known as?)

What is this?

### No (because it isn't complete)

Will this circuit be able to light the bulbs up? (Why or why not?)

### Parallel

What kind of circuit is this?

What is this?

### Series

What kind of circuit is this?

What is this?

### potential difference (voltage)

Charge will flow when there is ________

### alternating current

When a current flows to and fro, it's called _________

### direct current

When a current flow takes place along one direction, it's called ________

### electric current

________ is the flow of electric charge

### resistor

A ________ regulates and slows down the flow of electrons by becoming more narrow or by conducting electricity poorly.

### conduction electrons

__________________ are electrons that in solid conductors are carrying the charge through the circuit because they are fee to move throughout the atomic network.

### through

Charge flows ______ a circuit

### across

Voltage is applied _____ a circuit

### conductor

The electric resistance is the resistance the _________ offers to the flow of charge.

### conductivity

The resistance of a wire depends on the _________ of the material used in the wire

### P=IV

What formula would you use to find power?

### I = V/R (or) I = Q/T

What 2 formulas would you use to find current?

### V = PEe/q

What formula would you use to find voltage?

electrical

### generator

changes MECHANICAL energy to ELECTRICAL energy`

### electric motor

changes ELECTRICAL energy into MECHANICAL energy

### simple transformer consists of

primary and secondary coils

### they keep their magnetic properties for a LONG TIME

permanent magnets

magnetic field

### current that REVERSES direction

alternating current

magnetic poles

direct current

transformer

a direct current

### step up transformer

increases voltage

### magnetic force of a magnet

strongest at the poles

### atoms in a magnet

aligned according to magnetic fields

a magnetic field

### step up transformer

the number of turns of wire is greater in the secondary coil than in the primary coil and the output voltage exceeds the input voltage

### breaking a magnet

each piece will have STILL HAVE TWO POLES

### electromagnets are temporary

because the magnetic field only exists when current flows through the wire coil

### ways to increase magnet field of a magnet

increases the number of turns of wire
increase the current in the coil
add an iron core the electromagnet

### STEP DOWN TRANSFORMER

THE VOLTAGE DECREASES

### voltage difference

measured in volts

### lightning

a large discharge of static electricity

### fuse

small piece of metal that is designed to melt and disconnect

### resistance

tendency to oppose the flow of electrons (stop)

### circuit breaker

a small piece of metal that is designed to bend and disconnect

### voltage difference

causes electrical current to flow

### insulator

electrons do not easily flow through

### charging by induction

rearrangement of electrons on a neutral object caused by a nearby charged object

### static discharge

lasts for only a fraction of a second

### electrical energy

the current that flows in an electric circuit

### dry cell

battery is comprised of 2 electrodes surrounded by an electrolyte paste

### wet cell

battery contains metal plates that are submerged in a liquid conducting solution

### ampere

SI unit for current

### dry cell

one source of constant electric current

### electrical power

rate at which an electrical device converts energy from one form to another

### charging by contact

transfer of charge that occurs when one object touches another object

### series circuit

causes an entire string of lights to go out when one goes out

### parallel circuit

the way homes are wired

one route

### parallel circuit

more than one route

### You use a power 1500 watt hair heater for 3 hours. How many kilowatt-hours of electricity did you use?

Solution
You used 4.5 kilowatt-hours of electricity.
Looking for the number of kilowatt-hours.
Formula: E=Power X Time
1500 watts X 3 hours = 4500 watt-hours

### Broken Magnet

each piece would have a north and south end (pole).